A recent analysis of mobile market data provides some interesting insights into the current state of mobile apps and where the money is. Mobile Orchard did a good summary covering data from Flurry, a mobile analytics firm.
The key data is centered around where the apps are and where consumers are using them. You can see from the graph below that the iPhone marketplace is an order of magnitude ahead of other platforms right now.
Read the full text of the Mobile Orchard’s summary here.