The Shell Collector - Hugh Howey. I've read all his stuff, enjoyed them all.
I read The Old Man's War again the other day, now I want to read Ghost Brigades again.
Finally got to Ubik, I enjoyed it.
I just recently finished Canticle For Leibowitz, I'm trying to finish up all of the SF Masterworks.
Problem with that list is that there's a lot of Fantasy and not a lot of Science Fiction.
I recently read "The Stars My Destination" and "Godwhale".
Godwhale was really good, I thoroughly enjoyed it. A dystopian/sci-fi mixture. Semi-dystopian, anyways. You just gotta read it. It's very different and very fun.
Michael and Tom, I think you'd love this one if you haven't read it yet.