On the iPhone’s App Store app, at the bottom of the details page for every app is a downloads count. Given that the only way to download a non-free app is to buy it, it more or less puts sales figures out in the open. These download numbers are not visible in iTunes — only in the App Store app.

This is interesting for a couple of reasons. First, obviously, you can look at popular apps figure out how much money they (and Apple) have made. As I type this, Sega’s Super Monkey Ball game has been downloaded 10,955 times, and costs $9.99. That’s $109,440 in revenue in under a day [...]