It looks likes the applications on the I phone are going to be restricted …or at least managed in very tight way by Apple. There is discussion on the net suggesting that the phone may in effect be locked down with no possibility for third party apps. Steve Jobs says that it is best to think of the I phone more like an I POD rather than a PC. If it is true and you really cant load other apps on the I Phone then I think it will be thought of as more of a domestic market product than business mobile computing tool.

http://www.bit-tech.net/news/2007/01/12/no_third_party_apps_on_iPhone/