http://www.worldoftanks.com/about.html
From what I can garner, this is basically an team-focused MMO where your character is a tank. Apparently, it's realistic so you won't see Panzer 2 shells penetrating Sherman armor and whatnot. The closed beta is due to start on July 8 and I just sent my application. Best of all, it's FREE! It also has good graphics.
Screenshots:
http://www.worldoftanks.com/screenshots.html
If you want a beta key, go
HERE. Hurry, there's only 3,000 beta keys. After that go register
HERE, download the client and wait until July 8 to play.
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"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it."
-Terry Pratchett