On April 17th, Valve will announce the next batch of games and software titles to advance through Steam Greenlight, and be offered worldwide distribution via Steam.
Steam Greenlight is a system that enlists the community's help in picking some of the next games and software to be released on Steam. Developers post information, screenshots, and videos for their game and seek a critical mass of community support in order to get selected for distribution. Steam Greenlight also helps developers get feedback from potential customers and start creating an active community around their game as early in the development process as they like.
On the front page of Steam Greenlight, you'll find a personalized queue of games, asking you to vote for items you would buy or play on Steam.