I realized something while responding to another thread. (http://forums.macrumors.com/showthread.php?t=1061311) Someone asked how to protect their new Air from office theft, since it lacks a Kensington-lock slot. We said: lock it in a drawer or take it with you. He said: But what if it is busy downloading or processing? The answer is the same, after turning on InsomniaX (free app that keeps the machine awake when closed). I'm used to thinking that my laptop shouldn't be moved much while it's busy, because a jolt might damage the hard drive. But the Air's SSD changes the game. As I wrote in the other thread: Do you need to go to class while downloading a movie for tonight? (Legally, of course.) No problem, if you have campus-wide wifi. Turn on InsomniaX, toss the Air in your bag, and go.