When I got my iphone there was a problem syncing it with windows vista 64 so I synced it with my ibook G4, the problem is now I don't have any room on my ibook but want to add more to the iPhone.

The music I can get back easily for the most part but I don't want to lose the applications/movies/music I have purchased on the app store when I transfer over. Does anyone know if there is an easy way to do this?