I wrote othello/reversi in labview once. That would be a somewhat easy game to put into the zune. How about tic tac toe! hahaha.
I know XNA is limited...but you have .net framework still. if you could get access to lower level instructions on the zune...maybe network connection could be possible. Maybe microsoft will release version 3.2 with web browser
Good thread though. I want NES emulator! Tetris,super mario broithers, etc...
Tetris could be done.
back to the network....what if you could fake your pc into pretending its a zune. then your zune could connect to it over the wifi like it was a zune device. And you could have that PC app translate inforamtion for it? Web Browser...?
edit: im going to download wireshark and see if i can hack the transfer protocol. That would be nice