The media center edition of Gentoox Linux.
Gentoox Linux is an adaptation of the popular source based Linux distribution called Gentoo. It is compiled from Stage 1 with full optimizations to run on a Microsoft Xbox games console. Software or hardware mods are required.
Gentoox runs along side games - you get 3 choices during installation: E, F and Native. Both E and F create a loopback filesystem meaning that none of your drives are formatted during installation (except for cache partitions). If you choose "Native", then your F: partition is formatted to ReiserFS (making it inaccessible to Xbox applications).
Gentoox can be loaded via a .xbe file, or from a Cromwell based BIOS (which can be flashed to your modchip during installation). When using E or F installations, you are totally risk free - if you dont like Gentoox, simply delete all the files it installs (about 7 in total) and its gone.
All Gentoox versions are 100% free and opensource.