O’Reilly’s Ben Lorica slices and dices current app trends for iPhone and Android (nice data points on price stabilization too):
“While it might be true that the number of Book apps is growing at a faster rate, Games continue to dominate the list of popular U.S. iTunes Apps. Games accounted for about a fifth of all iTunes apps over the past weekâ , but the category continued to have a disproportionate share of the Top 100 charts, accounting for 52% of the Top Grossing, 56% of the Top Paid, and 50% of the Top Free apps.”
http://radar.oreilly.com/2009/11/games-top-the-charts-iphone-android-markets.html