You forgot OLPC, mithro. They have a good ideas list for doing games for the OLPC such as Mastermind, flash cards, typing tutor, and a small 3D game. I think both TP and OLPC sound like great GSoC projects so Hooray for FOSS Gaming!
"Luke, I'm yer father, eh. Come over to the dark side, you hoser." -- Dave Thomas, "Strange Brew"