-> Unreal runs fine on a P2 (the original one of course) and sequel Return to Na Pali. You even can go online. -(in fact a 'must try' if you're in FPS stuff)-
-> Quake2.
-> Jane's Longbow 2, is excellent, if you like heli combat sims.
-> Comanche 3 should also be fine on a P2 (not sure, I've played it on a P3)
-> Tombraider t'll TR5 can go on a P2 I thought, but all those TRs sux anyway, to avoid. TR series =>
You know, it would be easier if you stated WHAT GENRE of games you like.
*Seconds Half-Life, and of course OpFor and Blue Shift.