Okay, people can still get beta keys for those who are interested. Here is how:
Go to
http://contest.mmosite.com/giveaway/world_of_tanks/Then sign up to create an account. All they require is a valid email address. I just used a spam email for mine. They do not require additional personal info like your name and such, which is nice.
Once you have activated your account, go back to that link I posted above, sign in to the website if you haven't already, then click the button on the page (or link, can't remember which) to claim your beta key.
Once you get your key, go to worldoftanks.com. Click "Join Beta" button and then on the next page click "REGISTER" on the left-hand menu. From there, fill in the information, including your key you received from MMOSite.com and submit. It will then take you to the download page...and you're set.
LATEZ!
-Bonx