The latest Mobile Metrics Report from AdMob for July 2009 shows that iPhone users download an average of 10.2 applications from the App Store per month, with 2.6 of those paid. However, iPod touch users appear to be more app-hungry, downloading an average of 18.4 each month, with two paid.

Most users surveyed paid for their applications after upgrading from a “lite” version of the same application, suggesting most prefer to try before they buy. The average iPhone user spend $9.49 per month on the App Store, bringing in $125 million from the 26.4 million user install base in total revenue each month. The 18.6 million iPod touch users spend an average of $9.79 each month, capturing $73 million in sales.