Spellforce Platinum (still in the first campaign... fun and epic game)
Sword of the Stars: Argos Naval Yard (best 4X game I've played)
Flatout (made my way through Bronze and Silver, now on Gold)
Neverwinter Nights 2 (still playing Act 2 of the original campaign)
Evochron Legends (great indie space game)
Immortal Cities: Children of the Nile (just bought; played 2 of 3 tutorials)
Take Command: 2nd Manassas (just bought; played 1 of 4 tutorials)

Interesting thread.
This week I've played:
PC: Heroes of Might and Magic (finished at last!), UFO: Enemy Unknown (will probably never finish!), Monkey Island SE (finished), Spider Solitaire, World of Warcraft.
Blackberry: Brickbreaker.
I saw that for the first time ever, last week, at a dive bar in Yuma, Arizona. Back in Australia we have laws about the responsible serving of alcohol, which clearly don't apply in the US.

I played every game on every emulator I have, and Halo Custom Edition.

Gothic 3. After they realased a community patch 1.72 the game turned from unplayable to excellent. Great, great game.

In about 5 minutes I'll be playing the new Wallace & Gromit

Some oldschool Hexen and Quake..

Re-bought Diablo 2 and Lord of Destruction for the third time (what is up with all the Blizzard game CD's disappearing?), and currently playing through Act I. Feeling addicted already...
Also stuck in a cycle where I start new games in Civilization IV, then quit after about 30 minutes, just to start another new game. Heh.

Fallout, Quake Wars, Fallout 3, Trine and Doom 2.

Not sure if you heard of the option to register your games with Blizzard and gain the option to download them when you want. The nice part is they don't phone home - this means you can burn the install folders to disc if you want and install offline. Very cool. :)
What I've played:
Street Fighter IV
Heroes of Might and Magic
Larva Mortus
Oblivion
Prince of Persia 2008
Command & Conquer 3 demo

Yes, that is the first thing I did this time. I could not locate my old jewel-cases so there was no way to enter my old cd-keys.
Thanks though! :)

Guild Wars, ArmA Gold, Unreal Tournament 3, and about ten hours into Oblivion (it's gonna be a long one!)

Would you recommend Dawn of War 2 for the single-player part only? (I'm not really into multiplayer RTS)

Do console games count?
I played FF VII on my PSP and FFIV: The afteryears Wiiware. For the PC, I played Hocus Pocus, Blake Stone, and Rise of the Triad. Rise of the Triad was a killer app on an 8-player LAN. I really need to go buy Shadow warrior and Raptor from the 3d Realms store unless GOG gets it 1st.

Yep, I've enjoyed the hell out of it and I haven't touched multiplayer other than the rather good coop mode.
Also I'm not sure if its worldwide but a mate here just told me that steam has a half price sale on relic games so you might be able to pick it up cheap

It is, and I just got it for half price. Downloading now... hopefully I'll get to play it during the weekend.
Thanks for the feedback, I appreciate it.