I think that being able to transfer content (urls/documents/photos/videos) should be easiear between a mac and an iphone/ipod. A sharing application using bonjour could be made… one on the mac and one running on the iphone. If I’m reading a pdf or a document, I would like to have a “Send to iphone” option in the Services menu… the pdf is sent to the iphone and i can continue reading on it starting at the page i was on… Similar behaviour could be created for other type of media…