Congratulations! I think this shows the benefit of being a YCombinator company and getting lots of press because of it, starting with TechCrunch. As some have noted, the company simply takes the feed from http://www.mochiads.com/publishers.html and allows users to insert a snippet of html containing embed code for that game (with heyzap's affiliate id) onto their site. On the other hand, it's that kind of simple idea that all one needs for the first version, and also proof that one really doesn't know what to expect from the media and the users until they launch, and so the only way to know how the market will truly respond is to create and release something.
We pull games from Kongregate, AddictinGames and others too, we also let game developers upload games. The game content is already out there we are most aggressive in making sure we have all the best games.
We focus completely on publishers, which no one else is doing and where we innovate. Our API and contextualized games adds to this capability. More coming.