Yep. Met many.
http://www.facebook.com/album.php?aid=111052&id=657020755
http://www.facebook.com/album.php?aid=189917&id=657020755
Nichelle Nichols: Very nice and sweet old lady
George Takei: Awesome, fun-loving guy, but has a serious side on stuff he cares about
Malcolm McDowell: Nice, but kind of introverted
Ethan Phillips and Robert Picardo: I swear they're the new Abbot and Costello
Jason Momoa: Neat, outgoing guy
Rachel Luttrell: Funny, happy, shorter than I expected
Christopher Heyerdahl: Loves any attention he can get
Clifton Collins: Laid-back, easy-going guy; not fazed by much
Vanessa Angel: Happy, out-going
Kevin Sorbo: Freaking hilarious, and a riot to be around
Edward James Olmos: Cool old guy, but he's not sure which roles he wants to play up more
Katee Sackoff: Didn't have much interaction with her, but still seems quite nice
Catherine Hicks: Overwhelmed with the love from the Sci-Fi community; very, absolutely nice and wonderful
Dominic Keating: Funny, alright singer, shorter than I expected
Torri Higginson: Out-going and happy
Plus, I've met many sci-fi authors, and most of them are pretty cool. It'd be hard to list them all, but get Peter David, Michael Jan Friedman, and Keith R. A. DeCandido into a room together and expect the unexpected, because they will have you laughing your butt off.