Because of steam I've been playing Team Fortress 2 quite a lot. As mentioned before it's free and mindless fun.
I've also gotten heavily into learning to fly the PMDG 747 in FSX. Picked up FSX Gold for $30 the other week. I never thought all those procedures (and not a whiff of combat) would hook me in, but I'm nearing 35 so I guess I'm inclined to go this route?
Then I've also been playing ROF, "ARMA 2 OA" and my old favourite 'Day of Defeat'.
Yesterday I fired up IL2 1946 as I had P-38 withdrawal and for a second I thought I was playing Capcom's 1942, amazing how aged the graphics have become after COD/ROF.
I forgot to mention I was playing COD a lot until the last patch. The AI drives me nuts and online is too empty so I'm afraid I'm bored of it at the moment.