Just got one from CheapAssGamer for being a user for over a year, but my machine clearly doesn't have the specs to run that game (and I just don't have the time to invest in it due to university studies). So, it's up for grabs in the Spoiler below:

MAWSY-5M5MM-SFEL6-36KZX-AX4L3

All you have to do is create an account on playhawken.com and click the 'Redeem Code' link in the upper-right corner of the screen. It should look like this:

I cant run it either. nice of you to give away the beta key though.

Redeem the code "HAWKEN_Polygon" after you signup if you want in on the next closed beta. There is 10000 places available.

I guess someone used the code already. :(

:(