I've met, in no particular order:
Chase Masterson (Leeta the dabo girl on DS9)
Robert Trebor (Salmonius on Hercules/Xena)
Alexandra Tydings (Aphrodite on Hercules/Xena)
Eric Estrada (Ponch on CHIPS)
Gigi Edgley (Chiana on Farscape)
Claudia Black (Aeryn Sun on Farscape)
Ellen Muth (George Lass on Dead Like Me)
Eliza James (violinist for Burt Bacharach and girlfriend of Limp Bizkit's drummer, John Otto)
the band members of GWAR
Steve Jackson (Steve Jackson Games)
Walter Koenig (Pavel Checkov on Star Trek, Bester on Bablyon 5)
Jason Carter (Marcus on Babylon 5)
Richard Biggs (Dr. Franklen, Babylon 5)
---I played tinwhistle with Jason and Richard at Dragon*Con the year they were there, while they were jamming at the late-night drum circle. Was hecka fun. RIP Richard.
Warren Buffet (Famous investor/businessman)
Alan Bean (Astronaut. I used to work security where he lives in Houston, a long time ago)
Dominique Sachse (Channel 2 News Anchor in Houston. Lived in the same neighborhood that Alan Bean did)
---Mr. Bean was hecka nice..just kind of a 'regular ol' guy' and would talk with me all the time. My only communication with Dominique, on the other hand, was her getting pissed because I didn't open the security gate for her fast enough because I was helping one of our elderly residents with her mail. Not a good first impression.
Lived down the street from, and was friends with Alan Price, guitarist for Dead Horse (middling successful band, sold about a million records and got radio play back in the day)
Kurtz and Straub, naturally.
Pete Abrams (Sluggy Freelance webcomic)
Anne MccAffrey (Dragonriders of Pern, among other books)
That's all I can think of at the moment. When I go to Dragon*Con, I get to hang out in the green room, but perhaps not surprisingly, I've never met a celeb there. On a slightly creepy note, someone once asked me for my autograph at Dragon*Con because they recognized me from my website (which does, admittedly, get 2 million hits a year now), but I really don't consider myself a celebrity in any shape or fashion. So I felt kind of weird about it. But I *have* gotten used to being recognized by every tinwhistle and flute maker at every festival I go to.