TonyMacx86 is a web site popular among hackintosh builders. Hackintosh is the term given to those that create Mac OS X computers from non-Apple hardware. TonyMacx86 provides a ton of useful information for building a hackintosh including guides to building a hackintosh, installing Mountain Lion, hardware recommendations, tips, and DSDT files. The site also has articles and videos to help you along. And if you need help or advice, their forum is a great place to go.
Check out TonyMacx86 at http://www.tonymacx86.com