It's very difficult to find a laptop that can easily be turned into Hackintosh. As mentioned in our Hackintosh compatibility guide, most laptops aren't good Hackintoshes, because the compact design of laptops makes it very difficult to replace non-compatible parts.
With this in mind, I've compiled a list of Hackintosh-compatible laptops, all of which can run Mac OS X Lion without the need to replace any hardware. Some of these laptops were chosen because they were exceptionally compatible with Mac OS X, while others were chosen because they had a large Hackintosh community backing them. Most of the guides provided below are from tonymacx86, and have files attached to them. To view and download attached files on tonymacx86, you have to register an account on the website.
Of course, keep in mind that no laptop will ever run Mac OS X as well as a real Macbook. But some laptops can get pretty close.
LATEST UPDATE (September 22, 2012): Added the Lenovo G470 to the list. Fixed archived links to tonymacx86.
HP ProBook 4530s ($500-$950)
Hackintosh Ability: This laptop is the only one on the list that I would recommend to someone without previous Hackintoshing experience-- when it comes to ease of installation, the ProBook 4530s is pretty much the gold standard. If you've never set up a Hackintosh before, get this laptop. It's even endorsed by tonymacx86 himself.
Most Hackintosh laptops require a ton of extra tweaking to get Mac OS X running well, but almost everything on the ProBook 4530s works automatically. WiFi, audio, ethernet, sleep, bluetooth, USB 3.0, the battery meter, the trackpad, and the SD card reader can all be enabled within a few minutes of your initial installation of Mac OS X. Tweaking can be kept to a minimum, since the HP ProBook 4530s forum on tonymacx86 has more or less figured out everything for you. If you're looking for a truly Hackintosh-friendly laptop, go with this one.
That being said, not everything is perfect. Bluetooth won't work after waking up from sleep, but screen brightness controls won't work before waking up from sleep. So you'll have to decide which feature is more important to you. Also, Bluetooth doesn't work after a restart (only a cold bootup will make it work), the VGA port is unreliable, and the external microphone doesn't work at all. However, don't let all of these problems with the 4530s discourage you; none of the problems really affect the laptop's usability. In fact, the 4530s actually has fewer problems than most Hackintosh laptops. It just happens that the glitches for the 4530s are better documented.
Resources: Snow Leopard install guide | Lion install guide | Forum | FAQ
HP ProBook 4430s ($500-$700)
What You Get: The ProBook 4430s is the smaller brother of the 4530s. While the design and most of the technical specifications are identical, the 4430s uses a slightly smaller 14-inch screen. Additionally, while the 4430s can use both Intel Core i3 and Core i5 processors, there aren't any models with Core i7. With such a compact screen, this laptop begs a comparison to the 13-inch Macbook Pro. In most aspects, the 4430s and the 13-inch Macbook Pro are essentially equal. However, the lower price of the 4430s comes with its own costs: remember that ProBooks usually only get about 3 hours of battery life on Mac OS X, while the Macbook Pro tops off at nearly 7 hours.
Hackintosh Ability: The ProBook 4430s lives up to the Hackintosh-friendly reputation of the HP ProBook line. Compatibility-wise, the 4430s is just as good as the highly-regarded 4530s: all of the laptop's features work with little to no effort. However, like all ProBooks, the ProBook 4430s has issues with bluetooth and brightness controls, and the VGA port and external microphone don't work.
Resources: Snow Leopard install guide | Lion install guide | FAQ
The 4430s isn't a very popular Hackintosh laptop, so there aren't many Hackintoshing guides about it. Fortunately, Hackintoshing guides for the ProBook 4530s (linked above) usually work for the 4430s without any trouble.
HP ProBook 4730s ($800-$1100)
What You Get: The ProBook 4730s is a larger, higher-end version of the ProBook 4530s. Unlike the 4530s, the 4730s has a 17.3-inch screen, so it's large enough to replace your desktop computer. In addition, the ProBook 4730s uses higher-end parts; every model of the 4730s uses either a Core i5 or Core i7 processor. The 4730s also uses a discrete graphics card (the AMD Radeon 6490M) instead of the processor's built-in HD 3000 graphics.
Hackintosh Ability: The ProBook 4730s mostly works with Mac OS X Lion, but it's not nearly as Hackintosh-compatible as the 4530s. The graphics card in the 4730s (the AMD Radeon 6490M) doesn't work with Mac OS X, so you'll have to disable it in the BIOS. This isn't a huge loss, but it's inconvenient, and it definitely complicates the installation procedure. The 4730s also has problems displaying Mac OS X at the correct screen resolution, since it uses a different resolution (1600x900) than other ProBook models.
Most importantly, this laptop sometimes experiences graphical glitches in Mac OS X, that prevent you from using Mission Control or the Dock. Though it's not hard to work without the Mission Control and the Dock, it's extremely annoying, so keep this in mind. Otherwise, everything else (WiFi, audio. ethernet, trackpad, etc.) should work pretty well. Like all of the ProBooks, the 4730s has problems with bluetooth, brightness controls, the VGA port, and the microphone.
Resources: Snow Leopard install guide | Lion install guide | Improved Lion Install Guide | FAQ
The first two links are for the HP ProBook 4530s, but the installation procedure for the 4730s is pretty much the same. The third link is a mini-guide that's adapted specifically for the 4730s (though I recommend that you read the first two links beforehand).
Lenovo G470 ($500)
Hackintosh Ability: Setting up Mac OS X on the Lenovo G470 is not totally straightforward. Fortunately, the standard Unibeast installation method works. After the initial installation, all you have to do is run Multibeast once and install a few extra extra kext files. From there, almost everything will work properly: graphics, WiFi, ethernet, Bluetooth, sound, trackpad gestures, the battery meter, and even the Fn keys on the keyboard. The laptop does not automatically go to sleep when you close the lid, but you can still sleep manually (by clicking the "Sleep" button in the Apple icon menu, at the top-left of Mac OS X). The webcam also works, though it apparently suffers from brightness issues. The only parts of the laptop that don't work at all are the SD card reader and the brightness controls, neither of which is a major issue.
The biggest problem with the Lenovo G470 is the lack of easy-to-follow guides for it. Luckily, the process is reasonably brief: first, install Mac OS X Lion on your G470 with Unibeast. Download the DSDT file and some extra kexts (linked below in "Post-Installation Files"). Unzip the downloaded archive by double-clicking on it; a folder will appear. Drag the file "DSDT.aml" out from the folder, onto the desktop of Mac OS X. Run Multibeast and select these following options (choose whichever version of Patched AppleIntelCPUPowerManagement that applies for your copy of Mac OS X). Finally, install all of the kexts in the unzipped folder by using Kextbeast. You're done!
Resources: Lion Post-Installation Files | Lion installation thread
Lenovo IdeaPad B570 ($500-700)
Hackintosh Ability: With a good amount of tweaking, you can get everything on the Lenovo B570 to work except for the card reader. WiFi, ethernet, graphics, audio, CPU power management, battery, sleep, and the trackpad all work. The webcam does not work normally, though it works with the app CamTwist (this is a common Hackintosh quirk). However, the post-installation process for the B570 isn't a one-click process; installing Mac OS X on this laptop is much more complicated than running Multibeast. The guide for the B570 (provided in the "Resources" section below) is very hard to read if you're not already very familiar with Hackintoshing, so be warned.
To install Mac OS X Lion on the B570, instead of following tonymacx86's Unibeast method, you have to set up your own specialized iAtkos USB drive (with some extra kexts and a new smbios.plist file installed). After the initial installation of Lion, you'll have to work with nearly two-dozen separate kexts and other system files in the post-installation, since the guide for the B570 doesn't use Multibeast. Luckily, there's a DSDT file available for the B570, which enables audio and WiFi without the need for any more kexts. However, this DSDT only works with models of the B570 that use an Intel Core i3-2330m processor. If you have a different model of the B570, you can edit your own DSDT based off the DSDT for the Core i3-2330m model, but this is very complicated (we won't be covering DSDT editing on this website).
Resources: Lion installation guide
There are three downloads in the Lion installation guide (linked above). The first download is an "Extra" folder for your B570, which includes a DSDT file, system files, and general kexts. The second download is a set of extra power management kexts, which allow you to run Mac OS X without using the NullCPUPowerManagement and SleepEnabler kexts (from the first download). The third download is an improved DSDT file that enables WiFi and sound, so that you don't have to install the AppleHDA or IO80211Family kexts (from the first download).
Acer Aspire 5750G ($550-$830)
Hackintosh Ability: The Aspire 5750G has a smaller support community than the HP ProBook, but it still works pretty well with Mac OS X. The biggest problem with Hackintoshing this laptop is that there isn't any comprehensive, up-to-date guide about it. A lot of people have been able to get the 5750G running with full OS X compatibility, but the necessary information is spread throughout the 30+ page installation thread on tonymacx86.
All of the essentials, such as WiFi, audio, and the trackpad, will probably work when you install the kext pack (in the "Resources" section below). However, there are many different models of the 5750G, so full compatibility isn't guaranteed. Enabling gestures, such as two-finger scrolling, for the 5750G's trackpad can be particularly difficult. The 5750G's discrete graphics card probably won't work, so you'll have to turn it off in the BIOS, thereby eliminating the biggest advantage that the 5750G has over similarly-priced laptops. There is a DSDT patch (how to patch a DSDT) available for the 5750G, but your results may vary. This laptop definitely isn't a project for the light-hearted; the information is out there, but getting everything on this laptop to work with Mac OS X can be a lesson in frustration.
Resources: Kext pack | Lion install guide (archived) | DSDT patch | Trackpad kexts | Alternative audio kexts | 5750G Hackintosh thread
ASUS G53JW - A1 ($1400-$1700)
Hackintosh Ability: If you're looking for a high-end Hackintosh laptop, the ASUS G53Jw isn't a bad choice, as long as you're willing to spend some time on the installation. Be sure to get the A1 model of the G53Jw if you can-- this is the best supported model. There's a guide for installing Mac OS X on the G53Jw, but it's not a simple installation process, so you'll need some previous Hackintosh experience to pull off this install.
With the right kexts (available in the guide linked below), you can get it up and running with almost full functionality. Graphics, WiFi, audio, sleep, bluetooth, the trackpad, and even the keyboard backlights all work. The only things that don't work at all are the microphone, the SD card reader, and some of the Fn keys (function keys). Fn keys, microphones, and card readers are all optional components for a laptop, so depending on your needs, this might not even be a big deal.
Resources: ASUS G53Jw installation guide
ASUS G73Sw ($1400-$1800)
Hackintosh Ability: Unfortunately, there isn't a comprehensive guide to setting up Mac OS X on the G73Sw, so you'll need a lot of previous Hackintosh experience to pull off the installation. Once you finish the post-installation, most of the things work: graphics, WiFi, audio, sleep, bluetooth, and the trackpad. The keyboard backlights should work as well, though the results differ from person to person. However, like the G53Jw, the Fn keys and microphone on the G73Sw don't work. The SD card reader built into the laptop hasn't been confirmed to work, either. There is a DSDT patch available for the laptop on Olarila (how to patch a DSDT).
Resources: Kexts for Mac OS X Lion | Snow Leopard installation thread | Lion installation thread (archived) | DSDT Patch
In addition to these installation threads, check out the installation guide for ASUS G53Jw (in the above section). After installing Mac OS X Lion on the G73Sw, install all of the kexts from the above link called "Kexts".
There are a lot more compatible laptops in the Hackintoshing world, but most of them use outdated hardware, or don't have a coherent installation method for Mac OS X Lion. When this buyer's guide was created in March 25, 2012, there were only 4 laptops in this list. This list is constantly expanding, as I find more laptops that fulfill these requirements. For now, keep your eyes peeled on tonymacx86's laptop forum, as well as InsanelyMac's own notebook forum and tutorials section.