Currently leading as the most Anticipated Free MMOs of 2011 by MMOsite
This is a game based realtime Tank-simulation action.
PvP Centered and based on around 150 WWII tanks.
YouTube - World of Tanks - Gameplay Trailer - PC
It's still in closed beta but it's pretty good. So far I logged into the game and get around 13k+ players online (that's an awesome number of online players going up at the same time) - Registered players number to more than 500k and growing...
Good thing about it is there's no room creation, you just click battle and the server will automatically choose segregate you into a room based on your tank...for fast PvP!
Try it.
Pics:
Need BETA KEY?
CLICK HERE
*Link added for beta key.