I've recently been playing Torchlight. It's a classic dungeon runner, made by ex-blizzard employees. It's like a cross between Nethack and Warcraft 3 and Diablo II. Though it is funny to say, unlike online multi-player games, you can pause or stop playing the game whenever you like. This has really been the defacto for computer games since quite some time, but seems to be changing with MMORPGs and online FPS games.