I've had a beta key for a solid 2 months now. It's been fantastic. GameStop is running a deal where pre-ordering gets you a beta key. I feel obligated to pass this information along wherever I can.
Also, my battle.net name is now, and will be (when the game goes live), Dhinanta.dhinanta.
A side note: Blizzard has ripped off Warhammer Fantasy and 40k in every way possible really (Terran = Space Marines, Zerg = Tyranids, Protoss = Eldar). It's fun to think of their games in Warhammer terms sometimes :)
I actually feel compelled to do a full on unit comparison...expect that tonight/tomorrow.