Warp Pipe Project - GameCube Online
chadlnx writes "The Warp Pipe Project, an open source project to bring LAN-based GameCube games online, recently released a specification detailing how GameCubes communicate over a network. The Warp Pipe Project is aggressively seeking out developers who would be interested in this project through its SourceForge project page."
I found this Gamer's Internet Tunnel program a while back when attempting to play Starcraft without going through battle.net:
http://www.morpheussoftware.net/git/
It listens for almost any kind of traffic on a network, and relays it over TCP or UDP to another network, allowing LAN-only games to be played across the Internet. It might even work with GameCubes if you put a PC on the same LAN as one or more of them.