I keep my music and videos and etc. on my main desktop. My main desktop has fluctuated between being a Mac and a PC, but I've always used iTunes for my music organisation. All my mobile devices are made by Apple, whether it be my old MacBook, MBP, iPods, iPhones or my iPad. The iPods, iPhones and iPad can all sync with my iTunes library. But my MacBook cannot. I can't keep multiple libraries on more than one computer. That would be unwieldly and would run through my purchased music's DRM too quickly. The thing is, I don't want multiple copies of my iTunes library. I just want my music on all of my devices. As far as I know all the utilities that are out there that are supposed to sync iTunes libraries between computers absolutely suck, and of course they can't handle purchased content. So why can't we have iPod for Mac OS X? It would be available on all Apple portables. You can connect your MacBook/MBP/MBA to your desktop with its iTunes library (and hell, Apple can even charge for a proprietary USB cable for all I care) and it will sync just as though it's an iPod. Of course it's a separate application from the iTunes on your notebook, so you can't sync that music further to an iPod, iPhone, etc. They're completely separate. It's like your notebook is an iPod. This would be ideal for me. When I'm using my laptop, I don't want to have to listen to music on my iPhone and drain its battery unnecessarily. Chances are, I'm at work, a library, cafe, etc. I can sit down and plug my headphones into my notebook. But I've got no music on it. This solves that problem, with no licensing issues (since the notebook is just treated as another personal media device as long as there's some way Apple can prevent access to the files/encrypt them, etc.), and everyone's happy. I dunno, call me, crazy, but I'd love it if Apple would do this. I'd pick up an 11.6" MBA in a heartbeat. Honestly it's the fact that I won't be able to easily keep media synced between my computers that keeps me from replacing my iPad.