Depends what kind of games you're into. Stuff like Quake Live or Battlefield Heroes are good for the pick-up-and-play FPS fan. But FPS on a lappy can be a nightmare without a mouse
If you like RTS there's a fairly decent free online one called Shattered Galaxy that'll run on all but an Atari 2600 I used to play that ages ago.
Deus Ex, System Shock 2 and FreeSpace 2 would all get my vote as well.
In terms of racing games, you might get away with running Colin McRae Rally 2.0 (the best in the series), the original Driver and the first 2 Screamer games. I want all 3 of those soundtracks since my little brother seems to have lost all of my old discs!
Well, it depends, do u have connection there? LFS is good tho. And SoF2 (Soldier Of Fortune 2 Double Helix) - pretty good game, from year 2002 if im right and ive played it since it came out. Very fun game i gotta say.
Testdrive 2?
freelancer ( been said i just started playing it again now lol)
I recomend a cd i had called ultimate game collection like 1000 games that were decent
Rayman! those were the glory days
V8 supercars? F1 2004? there must be a few that work