John has a good post about the impact of the Apple App Store on our other blog that is worth a read, but I'd also encourage you to read this Moconews interview with Sega Mobile VP, Linda Chaplin.
Play close attention to her comments about discoverability and distribution. We love the iPhone and although our platform can't sell to iPhone users today, it just shows the future opportunities in front of us as other handset manufacturers launch their next generation devices which we will be able to reach.
On a side note, I've been playing Super Monkey Ball on John's iPhone today and if you have any doubt about the future of mobile gaming, take 5 minutes to play this game and you will be a believer. It is awesome!