http://www.cnn.com/2002/TECH/ptech/01/31/linux.ps2.idg/index.html http://playstation2-linux.com/
also good information on linuxdevices.com: http://www.linuxdevices.com/news/NS3628477348.html
which also points to nice Linux on DreamCast article: http://www.linuxdevices.com/articles/AT7466555948.html
./Jason