NetBSD also has a distro for the xbox, although what architecture doesn't NetBSD have a distro for? hell- you can run NetBSD from your toaster, LOL

sorry- a bit of nerd humor...
http://www.netbsd.org/Ports/playstation2/>NetBSD/playstation2 is a port of NetBSD to the SONY PlayStation 2.
To boot the kernel, you will require a special boot disc from SONY. The PlayStation 2 can not read CD-R/DVD-Rs. Currently, the only such disc available is the SONY Playstation 2 Linux distribution. This kit is now available worldwide. For more information, visit the official PlayStation 2 Linux site. The PS2 Linux Japanese site is also of interest.