You know what we could try playing? Quake Live, I haven't tried it out yet so I don't know if it's actually of decent quality/has some stupid sign-up BS to it or not, but it's free to play, and Quake is a pretty simple, fast and fun arena shooter to play amongst friends. If you guys are into it, it's not that big of a download and it could be some good entertainment.
edit: Also, Lethal League would be awesome to play among forumgoers here, it can be kind of tough connecting to people for 4 player free-for-alls with strangers, so if a couple people here got the game and jumped on it one night, it would be easy to use the invite function and get a game going. Believe me, it's an absolute blast to play once you get the hang of it!