I live right outside baltimore so we don't get all that many famous people here, but I've hung out with good charlotte before they were big, got sylvester stallones autograph, met blink 182, and my trophy one is hanging out with tracy morgan:
http://www.zilvia.net/f/showthread.php?t=66178 I've also hung out a bit with cast from mtv's reality bar crawls (real world, etc)
other than that unless you are counting racers (adam saruwatari, met him in the pits on a rainy sunday morning and watched weather channel with his team, and a bunch of other famous guys, craig paisley, etc), and sean glazer is friends with my brother.
KEvin