Apple Push Notification service and In App Purchasing: You can begin
developing with these APIs immediately. The Apple Push Notification service
guide provides detailed technical information on how to make the most of push
services for your app. You'll also find detailed technical information on
developing for In App Purchasing with the Store Kit reference guide.
We will also be providing access to beta test servers during the iPhone OS 3.0
developer beta period. Access to these test servers will initially be limited, but
be made more broadly available during the beta period. We will provide more
information on how to take advantage of this test environment as it becomes
available.