Shawn Blanc has this to say about WWDC and iCloud
iCloud cuts the USB cord between our computers and our iPhones. It “demotes” the Mac and the PC to the same plane as the iPhone and the iPad. It lets you activate and update your iPhone from inside the car when you’re on your way home from the Apple store. It is something that lets you listen to a song on your iPod even though you bought it on your work computer.
But iCloud isn’t just a way to cut the USB cable. iCloud is an exciting and ambitious vision. It is the missing piece to get mobile computing to act the way it ought to.