XBMC media center was originally developed for the Xbox. Under the name of XBMC Atlantis beta 1, it is now available for Mac OS X (10.4 and 10.5), and can even be installed on the Apple TV. On the latest it further increases the number of supported multimedia format, such as the DivX.
For additional information, please visit: http://www.xbmc.org and the Mac-dedicated FAQ
[translation by Linathael]