Farmville, Mafia Wars and I was very, very sad when they took over Warstorm. I loved Warstorm, but then Zynga got their hands on it and the game was bastardized.
I stopped playing flash games in general because they were taking over my life and I was neglecting my 360. Plus it's more comfortable to sit on my bed for a ten hour gaming session than it is on a folding chair in from of my computer. =)
I don't play anything but my 360 (and my N64 on occasion )
This is pretty much where I'm at but instead of N64 I play tower defense games on my Android while I'm at work. When I stabilize a bit more financially I'll be getting a WP7.
Used to play Mafia Wars, Frontierville and Cityville. Stopped playing after hitting the point that I needed everything posted to my facebook wall in order to progress any further. I've decided that's just how Zynga does it's business, so I'm probably not going to start any of their other games.