Chameleon-Where to Get It
As you may know, booting Mac OSX on PC hardware requires the use of a separate "Boot Loader". Currently the most commonly used is Chameleon, which is an open-source project that has been developed by the team at VoodooProjects (aka. VoodooLabs), for the past few years.
There are a few different versions (or branches) available that are minor off-shoots of the main version (or trunk). While different updates may be applied to various branches, generally those updates that prove to be beneficial and stable will be added to the trunk version, and then various branches may then periodically be synced with the trunk to include all those updates as well.
If you already have Chameleon and everything works perfectly, there may not be a need to update. If you need it or want it, then pre-compiled packages and source downloads of the trunk and the Enoch branch can be found here.
The project page can be found here, where all the latest branches or trunk can be downloaded via svn or tarball, bug reports can be submitted and any documentation can be found.
You can also check out the VoodooProjects home page here, and see some of their other OSx86 tools/projects or visit the forums.