[jwegener]

Glad you liked my post! For the 45M figure, scroll down to 5:41 (or alternatively search the earnings call page for "App store in 77 countries, more than 45 million install base.")

Apple doesn't break out iPod Touch vs Traditional. So I used admob's numbers about the iTouch vs iPhone to arrive at the number of iPod Touch devices.

Yes, people outside the US buy apps :-P But it's useful to get a device penetration figure (8% of americans) and work with that to do market sizing for a vertical. You could obviously figure out the penetration figure broken down by each country, but that would be rather time consuming.

-Jonathan