Valve revealed that 3,195 games have been submitted to its Greenlight service, though 1,110 submitted games have received a ban for everything from inappropriate material to not being a serious project. 9,998,476 votes have been cast on the Greenlight projects by 949,156 Steam users.
Right now, there is what is described as 800 “legitimate, publicly visible items” on Steam Greenlight. Ten games have so far been approved for full Steam release.
Source: Joystiq