looking for a good multiplayer game

My friend and I are looking for a fun muiltiplayer game thats not too demanding on a system, so any old ones would do. Doesn't really matter what genre, but not really interested in FPS though. We have been tooling around with Warcraft 3 but were not really good at it though.Thanks for your replies.looking for a good multiplayer game
Seriously, no FPS? Well that's too bad. CS:S and DOD:S would have been perfect. looking for a good multiplayer game

• Warhammer 40,000 Dawn of War
• 40K DoW: Winter Assault
• 40K DoW: Dark Crusade
• Age of Empires: Gold Edition or Rise of Rome
• Age of Empires II : Any of the expansions
• Any MMO

That's all I can think of at the moment, keeping FPS genre out, and staying true to low system requirements. There are a lot more to be added to that list if I knew just exactly what the system requirements of your computer and his were.
(Dumb thing keeps giving me an Error when I try to edit my message. It's been doing that all day :( )I also forgot to add almost any of the Command %26 Conquer games. They are relatively easy to get by on system requirements. And right now they have an anthology being sold at most game stores for $20 that includes 5 different Command %26 Conquer titles.
Diablo 2 ftw
Thanks guys, I'll check those out.
Trackmania Nations, its free.