Right now, its:
FPS (CS; Source)
Sims (Flight Sim x)
RPG (Oblivion)
I rarely play the sims/RPG though. I'd actually have OBlivion on the top of the list if it wouldn't keep CTD'ing. you wouldn't believe how long ive been suffering with CTD's and that game (at least 5/6 months) ive tried everything to fix it and it never works.
I only get the CTD's outdoors as well, indoors, or in cities is very rare, but if i'm outside for more than 5mins i get booted to my desktop everytime, and its gotten worse thanks to Beths latest patch.
Shame, its a good game, but i cannot tolerate its major stability issues, no game should be this fragile. same feelings apply to Armed Assault, very flawed.
I enjoy the occational driving/racing game, ive had GTR2 for quite some time, but i refuse to play it till i can purchase a TRACKIR clip and a new headset, which wont be for a while (this is also why i dont play flight sim that much

, once you've experienced TrackIR you just cannot play sims without it

)