If I had to guess, I'd guess that Apple will be using Quattro's relationships to roll out an advertising service for free iPhone & iPod Touch applications - in exchange for their 30% cut, which is about right for an ad network.<p>I suspect Apple figured there was simply too much free-app monetization going on to escape untaxed, especially when they're bearing the costs of free application delivery. Perhaps Apple also realized that other parties were getting a bit too much insight into their marketplace through advertising.<p>If I'm right, this could be very unpleasant for advertising-related startups in this space that aren't Quattro. Now that Apple's got an iPhone app ad company, there's no reason why they won't make it <i>the</i> iPhone app ad company.