So how do you do some SEO in the AppStore?
As I had a chance to comment before, this is one of the big problems of the AppStore model: while SEO helped startups slowly but surely build up traffic and success by being relevant on the Web, the App model which killed the hyperlink basically removed that option for developers.
Or not.
SearchMan shows in this presentation you can actually do some basic SEO in the AppStore. Their tool actually is deisgned to help you do that so they're obviously biased but this is good reading and good sense. So if you're developing an iOS App, I'd suggest looking at these slides and trying their service (it's freemium): looks pretty cool.