I have hooked up my air to a larger monitor. And also have it setup to where they are not mirroring each other. BUT is there a way to designate which Monitor will be the main monitor. So the dock shows up on the NON air monitor. I an t figure out how to do that . (in the windows world you would tell it which one to be monitor 1 etc). Also, I noticed if I am on an application (i.e. Email or safari etc) and I take it to full screen, it moves what is on the 2nd monitor to blank. I have to keep it in NON frull screen. Is that normal? Or is there a setting where you tell the system if you go full screen to keep the other monitor available with what it has on it.