UPDATE (October 9, 2015): Yes, this still works on OS X El Capitan! You may have to update OSXFuse, but that's it. (Here at MacBreaker, we have a policy of avoiding the use of Terminal whenever possible.) This solution is compatible with every version of Mac OS X since Snow Leopard, including Lion, Mountain Lion, Mavericks, Yosemite, and even El Capitan. It's simpler, and you don't need to use Terminal. Despite these developments, however, we still recommend that you follow this guide and install third-party drivers anyways. Nowadays, you can actually just skip third-party drivers altogether by enabling Apple's native NTFS drivers through Terminal instead. This mini-guide merely repeats what we said in our last article about enabling NTFS write capabilities in Mac OS X, from back in 2012. Fortunately, you can enable NTFS writing on OS X with relatively little trouble- all it takes is a few drivers and 10 minutes of your time. Since many Hackintoshes dual-boot Windows and Mac OS X, being unable to share files between hard drives can lead to a lot of problems with file management. Attempting to drag a file into an NTFS drive in Mac OS X will only result in your mouse cursor turning into an error sign.
Mac OS X can read files on NTFS hard drives, but it can't write files to them, which is a glaring omission.
Windows uses the NTFS file system for its hard drives.