I used to love coming home and unwinding to a few rounds of Doom once upon a time but i haven't played anything specific in ages.
Killing anything that moved after a long day dealing with crap in a boiling hot, non air con office was a great way to unwind and certainly took my mind off the typical office problems i used to get.
Nowadays a few rounds on poker stars is about my lot or half an hour in sl but I may get back into doom or something similar again one day. It's great for relieving stress
