It is not Second Life™, but it is interesting. US$100k is always interesting…
You can get additional information at: GeForce eSports | World of Tanks $100k Open.
You can watch the broadcast of the competition at: http://www.twitch.tv/worldoftanks September 1 at 7PM PDT.
Or on demand at: YouTube WoT.
World of Tanks
This is a free to play game available online. See the WoT site. It is of course a pay-for-better-stuff style game.