I recently got my first macbook with the 128 13" MBA and am just in love with it. I have a large Lenovo IdeaPad that I intended to maintain as my primary laptop, but I have trouble going back to it after using this sleek all the time. I have a large iTunes library that includes: 8 gigs of music, tons of apps, and a large amount of gigs of TV shows and digital copies that I use for my iPhone and iPad. I want my MBA to be my primary computer for iTunes syncing, but the hard-drive isn't big enough and I wouldn't want to use it all on my library anyway. So I wanted to maintain my iTunes library on my 500GB external drive and then just plug that in when I want to use iTunes. I read guides from Apple.com on how to do this, and I've consolidated files and copied everything to the external drive, but when I try to choose a library when I open iTunes it won't let me select anything (or if I select it and nothing appears in my library in the iTunes program). Any suggestions on what I'm doing wrong? Thanks!!