On a serious note, I play Counter Strike Global Offensive and it's pretty fun to play. It's much better than CS1.6, considering it's still CS.
Some great old school callbacks in this thread, haha.
I just bought CS:GO during the recent Steam Daily sale ($3.75 US). I love it. Yes, yes, I'm one of those who fires up the team deathmatch but I gotta be me! I didnt realize CS:GO had quick respawn DM mode until I read something about it a couple of months back wouldve purchased it earlier! I never liked standard CS because of the round play (ie no auto-respawn - I realize that makes me no friend of the 1.6 crowd).
Switching gears a bit, I also play Day of Defeat Source - another Valve multiplayer game. Very fun. Also enjoyed the pre-Source version much like CS 1.6, some folks think DoD Source cannot compare to the original but I like it just fine.