I've been playing for quite sometime now and have enjoyed it thoroughly. They are still taking Beta testers and I believe Open Beta is scheduled for sometime next week. I enjoy it but, you'll need to look past some of the historical inaccuracies. Developers are working hard and I think it will be a great Tank Game as it matures.
Apply for a Closed beta key -
http://game.worldoftanks.com/registration/cbt/
Forum discussions -
http://forum.worldoftanks.com/