According to Business Insider, just 1 year later, Apple's iTunes App Store has made the iPhone the hottest gaming platform on earth:

Apple became not only the hottest mobile platform in the world -- which around 15,000 developers have made software for, and all of its major rivals have tried to replicate -- but arguably the hottest gaming platform in the world. No other platform has had such a rush of developer and consumer interest in the last year.

BI highlight big name developers like EA, Sega, and Gameloft jumping into the iPhone, but also great new studios forming around it like ngmoco. And with iPhone 3.0 and its 1000 new APIs like P2P gaming and in-app purchases, they suggest we might not have seen anything yet...