XMBC is a home theater application which runs in fullscreen, has a beautiful, modern interface, support for pictures, music and video collections and playlists, television and radio.
XBMC is a free and open source (GPL) software media player and entertainment hub for digital media for for Linux, OSX, Windows, and the original Xbox.
If you have ever owned an original Xbox you are probably familiar with this application, if not the software is a free, open source and very complete media player. It can play an entire spectrum of media formats and includes playlists, audio visualizations, slideshows, and weather forecast functions. XBMC has become a mature graphical user interface replacement for the original Xbox Dashboard, and it is currently also being ported to run natively under Linux, Mac OS X, and Microsoft Windows operating-system.