GameCube-Powered Webserver
Daniel Kolph writes "The GameCube Linux Project has just released, what they call the GameCube Linux Alpha
This is an 1 MB busybox-based Linux system that contains screen output, network code, a telnet server and a webserver. They also provide a kernel patch. (Screenshots/Download)"
Are you forgetting the hard drives in both the PS2 and Xbox? You can even have one on the Dreamcast with a bit of electronic hackery, (the other *nix running console you forgot to mention).