I have this above configuration and although it works fine in OSX (it would), XP via boot camp will not let me use the 20" cinema screen as the primary display, and every time it restarts it only wants to display on the macbook pro display. I have to manually select my configuration again. All I want is the Macbook Pro screen to act as a small external monitor, and have the 20" cinema screen as the primary display. Does anyone have any tips or workarounds? I was going to resort to an autohotkey macro but this still doesn't fix the problem fully.