A Phoronix reader wrote in this week to comment on the slow pace that Linux kernel development has been happening for the Xbox 360. The Free60.org project seeks to port GNU/Linux, BSD, Darwin, and other open-source operating systems to the Xbox 360. Since the middle of 2011, custom unsigned code can be executed on the game console with all of the Xbox 360 kernels. However, setting up the custom OS requires either a reset glitch hack for the console or for certain older consoles a SMC hack that requires soldering is involved. Obviously the process of loading Linux on the Xbox 360 isn't supported by Microsoft.
For those not familiar with Free60, visit Free60.org. The Linux kernel development page notes that they have patches against the Linux 2.6.33 kernel and requires adding in new PCI IDs, Xenon cputable support, other Xenon changes -- including an ugly hack for tiled frame-buffer support -- and additional out-of-tree kernel patches for sound and pad support. Still not yet achieved in the Xbox 360 Linux support is a sane way for frame-buffer support, better graphics support, and IR remote support. These Xbox 360 hackers actually think they may be able to reuse some of the open-source ATI/AMD Linux graphics drivers since the Xbox 360 uses ATI graphics hardware.
The patches and kernel compilation process for those interested is noted on this Free60 Wiki page.