Me and a friend have been doing some LAN gaming recently. I have a decent laptop (2.0 Ghz C2D, 2GB RAM, ATI X1700) but my friend is running Boot Camp on a ~2 year old MacBook with integrated graphics. We are interesting in finding more games that both of our computers can run. We may have others joining us soon, but let's assume that said MacBook is the "weakest link" among all the computers.

Games we have been playing so far:
Age of Empires 2
Starcraft
BF 1942
Unreal Tournament GOTY
Red Faction

Unfortunately, the CS 1.6 and all other original HL mods do not seem to work on my laptop. My video card drivers aren't compatible with OpenGL or something stupid like that. I spent a good while trying to find a fix for this about a year ago with no luck, and have since given up on it. I remember playing Sven Co-Op and loving it, but unless I find some miraculous fix for my video card, it is not an option.

Any other games you'd recommend?