Since 2007?
Wait a minute.
Apple didn't release the iPhone SDK until 2008!
It's true, Apple didn't release any information on iPhone development until 2008. We gave ourselves a head-start by reverse-engineering the iPhone SDK and writing apps for it, long before Apple let us.
In the summer of 2007 we developed the first fully-working version of our game Sumo! So when Apple announced the SDK, we were a year ahead of everyone else. Sumo was in the App Store on the day it opened. It quickly climbed to the Games Top 25 list and was chosen as a Staff Pick.