Tom Hanks (he said that he is a huge fan of Sci-Fi and trek in particular. he also said that when ever he talks to patrick stewart he can't talk about anything besides TNG, and apprently he wanted to play cochran on ST:FC)
king Abdulla of Jordan (he actually had a brief cameo in VOY)
Jason Alexander (I personally belive he is the first Trekkie, as he loved trek before it was even aired - he auditiond for the part of Kirk. and of course, he also apeard on VOY)
Paul Allen (co - founder of microsoft, according to forbes magazine eh is the third richest man on earth. among other things, he have founded the science fiction museum in seatle)
Matt Groening (There are lots and lots of Trek refences in The Simpsons, and even more in Futurama, the biggest reference is of course the episode "where no fan has gone before")
Vin Diesel
John logan (writer, wrote the script for gladiator and nemesis)
Manny Coto (he writes for some show on UPN
)