I'm probably going to get judged a dweeb here, but I've been on this huge Black Library kick...I've been keeping pace with the Warhammer 40K: Horus Heresy series they've been putting out and I'm halfway through the Ultramarines Omnibus.
Usually I don't read stuff based off of table-top games, etc, but they've got some seriously talented authors on the payroll (Dan Abnett, Mike Lee, and Graham McNeill to name a few). Granted some are the blah stuff you'd expect when the author is 'playing in another person's playground', but several of the authors have made it their own and really ran with it (Abnett's Gaunt's Ghosts series is absolutely incredible.)

I think I just lost my nerd street cred there.

(Favorite American sci-fi/fantasy author is L.E. Modesitt...his stuff is awesome)