At the moment I'm working through F3: New Vegas, and as someone said up-thread, its good fun. So much different from the standard post apocolyptic game.
I do have Fallout 3 now thanks to a board member who just gifted it to me.
I'll probably give Magicka a try next. I picked up the complete pack (base game + all the DLC) on Steam last night for $10. I tried the first few minutes of the tutorial and I'm a bit concerned about the spell casting system. It seems awfully complex, and I'm worried I'm going to completely forget the key combos in the heat of battle.