http://steamcommunity.com/greenlight/
Valve's newest thing, showing everyone else how it's done. All hail the Gaming Messiah, amen.
Seems like it's inspired in part by things like Kickstarter. A developer tosses up their project in whatever state it's in when they're ready to announce it, and if the project receives enough positive votes from the community, Valve will greenlight it for sale and distribution through Steam. Sounds like there's no time limit, either, so the project will remain up for as long as it takes to gather the votes, or until the leader decides to take it down.
I'm really liking the implications of this if it takes off.