During the WWDC 2009 Keynote, Apple announced that over 40,000,000 iPhones and iPods touches had been sold to date. We know what that looks like in the smartphone market space, but now Gizmodo has done some research and shown us what that might just look like in the gaming platform space as well. (See graph above).
Might explain why we see so many games already, and as Gizmodo points out:
Combine this with the fact that the faster graphics support in the iPhone 3GS is going to make it a pretty damn good gaming device, you've got a juicy target for game developers to hit.