Here's the idea behind my company: iPhone developers want people to download their app. Generally they pay for ads through a service such as admob which has a terrible conversion rate. My company gives users paid apps for free and provides the developer with downloads.

Here's how it works from a developer standpoint: 1) You create a campaign. This campaign contains a multiple choice question that would be hard for someone to know that didn't actually buy the app. (aka whats the second persons name under the credits or something like that.... its partly honor system based although incorrect guesses are punished). 2) A user downloads your app, and answers the question you created. If they answer correctly they get paid the amount you specified (minimum of the price of the app).

In this way users get great apps and developers get their app out in the wild!

Does that clear things up?