Ever wanted to play an MMO where you are not a druid, or an elf, or a mage, but a TANK? Then World of Tanks is for you.
The game, by Wargaming, lets you drive pretty much every significant tank of the mid-20th century, as you join a team of tanks to go off and fight another team of tanks. Like Team Fortress 2, or Counter-Strike, only, with tanks.
Your armoured vehicle of choice is your "character", which you level up as you play, while the game also has some peripheral elements like strategy.
A second round of open beta testing is about to begin, which you can sign up for here.
Having not gotten around to it last time, I've already signed up for this round. Sure, I normally can't abide MMOs, but then most MMOs aren't called WORLD OF TANKS.