I have so many RPGs in my queue it's not funny. I also just picked up Witcher 2 in a sale. I tried Witcher 1, but the combat seemed pretty boring. Rain Slick 3 is in there. I just picked up Dark Souls. Eschelon. Avadon.
I'm surprised nobody mentioned Path of Exile yet. It's free, and if you're looking for a spiritual successor to Diablo 2, I'd say that's the way to go. I actually enjoyed Diablo 3 somewhat, even with all the bizarre design choices.
Some other ones I liked:
Legend of Grimrock
Avernum (the new one)
Dragon Age Origins
Skyrim (duh)