Is there a sample project showing how to use APNS on the IPhone and how to set up things? I'm currently looking at the documentation but it would be nice to have some working code to pick apart and see how it all works together?
I can't seem to find anything using google or in the iphone dev center.
A good place to start is Urban Airship. You can set up a free basic account that will do all of the server-side work of sending push notifications to Apple's servers. They also do a great job of walking you through all of the steps needed to get your application working with their service, and have excellent sample code that shows how to register your application for notifications.
I have no other affiliation with them other than being a happy user of their service.
There really isn't much code to write on the iPhone side. You need to get the unique token of the iPhone or iPod Touch and then relay that token to your server. Getting the token requires a call to UIApplication but there's no predefined way of getting that to your server. One of my apps performs an HTTP POST to a PHP script that puts the token into a database.
If you're curious about provisioning and the setup of the certificates, etc..., you might check out the Apple Push Notification Service Programming Guide.
Look in the forums in the iPhone dev center, supposedly there are a lot of examples of server side code to talk to Apple's push server.
