Torchlight is a dungeon crawler game that came out in the last year or two by an independent game company and it is actually pretty good. It is like Diablo, but with prettier ( and cartoonier) graphics and I believe a better plot. It normally goes for $20, but Steam (an online game download service) has a 24 hour offer for $5 if you may be interested. I bought it yesterday (for $10, grr) and I find it enjoyable. Oh, and its made on the free Ogre engine that DarkStorm mentioned in one of his previous posts. http://store.steampowered.com/app/41500/ Steam has a ton of sales going on now unit July 4th so I got a couple classics (like all the X-Com games) for super cheap.
I really like Torchlight due to its developer, and the involvement of Matt Uelmen (of Diablo 1/2/WoW soundtrack fame). And for the price it's really a nice little game!