Linux Kit

BlackRhino GNU/Linux
Free Debian-based GNU/Linux software distribution for the PlayStation 2. Includes package downloads, FAQ, and installation guide.
http://blackrhino.xrhino.com/

PlayStation 2 Linux Community
Official community. Offers documentation, drivers, and a directory of in-development software.
http://playstation2-linux.com/

PlayStation 2 Linux Games Programming
Tutorials, sample code, and links.
http://www.hsfortuna.pwp.blueyonder.co.uk/

PS2Dev.org
Tutorials, software, sample code, and mailing list.
http://ps2dev.org/

LinuxDevCenter
Article exploring Linux on the PlayStation 2, including hardware, installation, upgrades, alternatives, and game programming. By John Litter. <small>(March 25, 2004)</small>
http://www.linuxdevcenter.com/pub/a/linux/2004/03/25/ps2_linux.html

GameDev.net
Introductory article to game programming with the PlayStation 2 Linux Kit. By Rob Louie. <small>(July 25, 2003)</small>
http://www.gamedev.net/reference/articles/article1967.asp