Games from Within | Making A Living (Barely) On The iPhone App Store (aka The Numbers Post)
http://gamesfromwithin.com/making-a-living-barely-on-the-iphone-app-store
Enlightening. I'd heard that making a free version helped sales, but I didn't realize that In-App-Purchases (IAPs) could make that big an impact! Then again, I did purchase the expansion maps in Fieldrunners. I bet Tap-Tap Revenge makes good IAP numbers.
