A couple days ago, Apple turned on daily download stats for developers. This has confirmed that sales in the app store are going strong. While few developers have disclosed any information on what their numbers are, we do know a few things.
Sega has stated that they are on track to sell 1 million copies of Super Monkey Ball (App Store) this year.
The Facebook (App Store) native application has hit over 1 million users already.
It's obvious that free applications are dominating the top downloads while paid application are still getting respectable download numbers.