I just got the awesome email from Blizzard, but when I type in my key when adding a game it says key in use! Is anyone else getting this? I've been waiting for this game for ages. It's really sad that my key has been used :(

Any blues that can help me here?

Just contact our Billing support and they will figure it out with you. I am guessing you are from the US, so your contacts would be US Billing:

http://us.blizzard.com/support/index.xml?locale=en_US&gameId=13