I've got a number of autographed books, mostly SF writers; the ones I actually got in person that I recall sitting here are Robert J. Sawyer, Mike Resnick, and Roger MacBride Allen; there were a couple of others I got in person and several books that came autographed (including Archie Manning). Also have a printout for a reading autographed from Sawyer from a reading he did on an unreleased book. Lessee, from many, many years ago we have (somewhere) autographs of the band America, Peter Frampton, and also from the man: Jerry Clower. My wife got these while working at a hotel restaurant. Jerry stood up in the restaurant and sang to her after he gave her the autograph. He isn't known (by those who even remember Clower) for his singing. 
Oh, and John Palmer's book came with an autograph.
In honesty, though, these are all just stuck back somewhere (except Palmer's book, of course). The in-person SF autographs came while attending the one SF/Fantasy convention I attended. I carried some books with me and when I would see one of the authors at a coffee klatch or some such, I'd get an autograph. I was never willing to wait in line.
Rick
Oh, and John Palmer's book came with an autograph.
In honesty, though, these are all just stuck back somewhere (except Palmer's book, of course). The in-person SF autographs came while attending the one SF/Fantasy convention I attended. I carried some books with me and when I would see one of the authors at a coffee klatch or some such, I'd get an autograph. I was never willing to wait in line.
Rick