The crowdfunding platform Gambitious.com, specifically made for funding games, launches during E3 2012. Korstiaan Zandvliet of Gambitious just announced the date during his keynote at the Dutch Festival of Games-event.
The main difference between Gambitious and the currently popular Kickstarter is that the former does not rely on donations. Instead, a developer decides what percentage of the required funding people can buy. Someone who invests money in a project, becomes a shareholder and is entitled to dividends.
Gambitious initially launches in Europa, but is also coming to the United States as soon as legislation allows it. The company is waiting for a law which will make it possible for a platform like Gambitious to launch in the USA, which should happen in 2013.