I've got a Nano and an iPhone 3G. I've also got my work laptop and home laptop with the latest iTunes on it, Authorized with the same (and my only) iTunes account. The Nano I can plug in to either computer at anytime and transfer whatever music I want via drag and drop. However, the iPhone only works on the home laptop (where it was first initially) plugged in after I got it. When I plug it in on my work laptop, if you click on Music... it sees it, but it is all grayed out and I can't play anything or transfer anything. Any ideas? I thought you could sync an iPod on 2 different library's.