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.