Although I was initially quite skeptical about the need for yet another Diablo clone, after having played the recently released Torchlight (which is very reasonably priced at 20$) for an hour or two I must admit that I'm having a lot of fun so far. The art style is great (like a much-improved and more ambitious version of Fate) and the hack'n slash is satisfying and has some nice features which help differentiate and streamline the otherwise Diablo-like experience. Little things like the ability to send your familiar (either a cat or a dog) to town where it automatically sells off loot so you don't have to is a great idea which I haven't seen in similar games before (then again, I haven't played a roguelike dungeon crawler seriously since Diablo II). A level editor will be released soon which is part of the extensive modding support which the developers are providing, and it will definitely be interesting to see what kind of neat user-generated content the community will develop during the coming months...
More info here:
http://www.torchlightgame.com
The game is also available from Steam, GamersGate, Impulse and probably a lot of other places as well.