Trekexpo.net has launched it's official site with guest lists and ticket packages.  This being the 20th anniversary, fans are in for a real treat. Located in Tulsa, Oklahoma, Trek Expo is one of the largest fan run Star Trek Conventions.

The Expo runs June 26 - June 28, 2009.

Guest list after the jump.

LEONARD NIMOY
SPOCK / STAR TREK: TOS

AVERY BROOKS
CAPTAIN SISKO / STAR TREK: DS9

MARINA SIRTIS
DEANNA TROY / STAR TREK: TNG

JOHN DeLANCIE
Q / STAR TREK: TNG

CIRROC LOFTON
JAKE SISKO / STAR TREK: DS9

GARRETT WANG
ENSIGN HARRY KIM / STAR TREK: VOYAGER

ANTHONY MONTGOMERY
TRAVIS MAYWEATHER / STAR TREK: ENTERPRISE

CHASE MASTERSON
LEETA  / STAR TREK: DS9

to list a few...

Check out the complete list here.