There are 10 times as many iPhone Apps as Android Apps available in their respective market.
Well, the iPhone has been out since June 2007 with over 20 million sales.
In the US, there are only 2 Android phones out from 1 carrier. And Android's been out less than a year.
I'm pretty sure as the Android user base grows, so will market share. There are a lot of Android phones in the pipeline. Right now, we're pretty much early adopters, so I wouldn't base the future of Android apps on current markets. This May article predicted a 900% increase in Android phone sales this year:
http://www.reghardware.co.uk/2009/05...yitcs_android/
Honestly, either Android will get more popular, and the apps will sell better, or it won't sell, and it'll be between Palm and Apple, in which case Apps are screwed.
Android does have the advantage of not being specific to any manufacturer, so my guess is, it'll continue to grow.