Well in excess of the minimum won't get you maximum
I have an AMD 3200+ CPU, 512mb ram and a 6600GT nvidia gfx card
and I can run it almost at top spec.
(Doom 3 that is)
There's also Night Trap I just found a version made for the pc, but I got bored quite fast.
I really like Splatterhouse 2 and complete it every so often in a religious type way.
There's S.T.A.L.K.E.R. shadow of chernobyl coming out sometime this year which has mutated people and animals, and you have to survive them. (killer sheep)
Life, Don't talk to me about Life.