One major category which i think isn't being used to it's potential is Business. When browsing the App Store, i always feel disappointed when going over the Business category due to it's lack of quality apps and it's emptiness. I'd love for the iPhone to take over the enterprise market. But i think more business oriented apps are needed to help make that progression. Having proper Word, Powerpoint, Excel editors on your iPhone would be such a great plus. I'm not a developer but i wish i could do something about this. My thoughts.