Glen Campbell - really nice guy (I was a kid and he was very kind to me)
Alan Rickman, Daniel Radcliffe and Jim Parsons. I've also got an amazing autograph collection, but most of those people I didn't get to actually talk to/shake hands with/hug. (Yes, I hugged Alan Rickman) The trick is to go to lots of Broadway plays and wait at the stage door after the performance. Also, many of the restaurants near theaters.