I have a three monitor setup. One 1920x1080 in the middle flanked by two 1280x1024s. Quite often I want to move a window from the left monitor to the right monitor (or vice versa).
What would be great (and it's a feature that http://www.realtimesoft.com/ultramon has) is a button in the title bar that when clicked displays a little popup asking which monitor the window should be moved to (see the attached screenshot from Ultramon). I think that for people using more than two monitors the ability to choose the destination monitor adhoc is more convenient that move to previous/next monitor, especially if monitors are not arranged in a horizontal pattern.
