I was a Treo user who switched over to an iPhone and want to know if I wrote an application for the iPhone that would only matter to me, would it be listed in the app store? What I have done in the past for my Treo was I wrote a program that calculates my regular salary, overtime and double time pay. That would be of no use to anyone else. So if I pay the developer fee, can I run the app on the iPhone to debug and does the app stay on the iPhone or does it have to be submitted and approved by the app store? Is there a way to keep the app private?