I think the issue here isn't that we're all shocked and appalled by the inability of a USB port to charge a huge battery. The issue is that we charge our iphones on USB all the time (and thus get used to doing it that way), and apple should be more clear ahead of time that "some computers may not charge the ipad when it is turned on". Neat device, but I'm saving that $500 towards the next uMBP revision.