Riot Games' League of Legends is one of the biggest free-to-play titles around -- it started off as a spiritual successor to the old Defense of the Ancients mod, but has since grown, strictly by word of mouth and organic growth, up into its own industry. Riot hasn't actually announced player numbers for the title yet, but this is a huge game online, persistently landing in the top spots on Steam and Xfire's most-played lists.

If you've never played (and why not? It's free!), the basic structure of the game has you controlling a champion on a real-time strategy-style battleground, and Riot has been releasing one of these new champions every few weeks for quite a while now. In the game's booth at E3 last week, we got to hear about three of the upcoming new champions, as well as brand new feature to the game designed to get even more players involved: A spectator mode.