Just started playing this game a few days ago, a ton of fun. DotA style gameplay with some nice customization elements that will be familiar to WoW players. Oh, and a ton of playable champions. The game is still in beta, but it seems pretty easy to get in. I have 5 invites they emailed me, or how I got in was signing up at zam.com.
Discuss the game if you've played, and if anyone wants one of these invites instead of signing up at Zam post or send me a message and I'll give you one of these beta keys I have no use for.