Great game. I still play it. Same mechanics as CS 1.6 but with added bots and optional higher resolution models and touched up maps. The old, untouched maps are there as well. The single point of suckage for this game was the addition of the riot shield. Whoever's responsible for that must have been on crack >.<
Waiting for CS:GO. Already got it for Windows, but rebooting always sucks. I want GO on Linux dammit! Now! :-)
Still waiting for DOTA 2. Hopefully it'll be the next game they port, it's already the most popular one on Steam and the amount of players continues to grow rapidly (50k in the last month alone, as far as I know). Also it's still in Beta, so it's under heavy development anyway.
They aren't in a hurry yet, but Valve needs to bring their most recent games to Linux to make it more relevant.
DOTA 2, CS: GO, L4D2, Portal 2, and possibly a HL3. With that, and showing that the Linux gaming market share is growing, and fast, will make more publishers to invest money into Linux ports.