Hello there, I've been playing Sc2 beta for about 2 months now, I was lucky enough to actually receive 6 beta keys since it has opened, I used 2 and gave away 3, however currently I am having a contest to give away my last one on my forum, I was told to share it with you guys by gogo .
http://www.gfxdrop.com/forum/showthread.php?t=8
The first person to get 150 credits and post in the thread will receive the unique beta key for use (instant activation via battle.net account - you download the game and install it directly from blizzard).
(credits are a virtual currency used on the forum, you can view information on them here: http://www.gfxdrop.com/forum/showthread.php?t=2 )