The folks over at App of the Day have put together a nice, comprehensive infographic on the state of the App Store. Their work is based on the App Store as of December 7, 2010.
The infographic addresses overall statistics and some insightful numbers on the mechanics of how the App Store operates.
For instance, out of the 300,000+ apps in the App Store, 85% are for the iPhone only. 67% of apps are paid and 33% are free. There are more universal apps than there are iPad apps. Out of all apps, 50% are between $0.99 and $2.99...