This article was a great read for anyone interested in upcoming iPhone App Store business. Of course, a lot of it is rampant speculation but it probably represents the best of the rampant speculation that we have. Also, check out the Digg.com comments for this article - it is very telling what the attitudes among future users and current developers are.
These are exciting times to be in mobile development and I think we can expect a lot of drama in the next five years. Is it going to be making millionaires or will the App Store be a billion dollar a year business? Or is Apple simply courting developers to their platforms so the rapidly defecting Windows crowd will have shiny new desktop applications waiting for them on the Mac?