GigaOm has a very interesting report up today on the actual size of the "app economies" for both the iPhone and Android. There are some fairly shocking data points, which come from mobile advertising startup AdMob, and they illustrate that both Apple's App Store and Android Market are big businesses, with lots of promise. These shockers include: 1) there are some $200 million worth of applications sold in Apple’s iPhone store every month, or about $2.4 billion a year; 2) the Android Market brings in about $5 million a month or $60 million a year; and 3) each month, Android and iPhone users download approximately 10 new apps. I agree with the GigaOm post that the Android numbers will probably rise sharply as many new handsets arrive before the end of this year. It's also interesting to think how big these businesses will be in 10 years. Check out more here.Â