“Phones will only run apps signed by Apple. It also applies FairPlay to the package.”
The SDK does look impressive. Hopefully CoreData will get added at some point.
Only one iPhone application can run at a time, and third-party applications never run in the background. This means that when users switch to another application, answer the phone, or check their email, the application they were using quits. (p. 16)
So much for showing off AIM at the launch event as an example of what you can do with the SDK. Unless you’re someone like AOL, you’re not going to be writing any useful social clients for the iPhone. Oh, and this makes the Kleiner Perkins iFund look even more of a joke than their Java fund a decade ago.