I've grown out of games big time, but the last one I played with any seriousness was Batman: Arkham Asylum on the Xbox. I enjoyed it, actually, more than I thought.
I used to be a pretty avid video gamer, but I'm very touch-and-go nowadays. I have a Wii and an Xbox 360 that more or less gather dust at this point. I tend to play PC stuff since with Steam, it's so much cheaper. Plus I'm always in front of the computer anyways. I missed the DotA craze, but am pretty hooked on League of Legends, it's been my only consistently-played game over the past few months, with a game a day or so.
Big fan of the Fallout series here, I've played all of them, and just finished New Vegas not too long ago. As a Bethesda fan though, I'm really looking forward to Skyrim, since I still go back to Oblivion and even Morrowind more often than I care to admit.