I've got 2 displays with very different resolution (which makes just stretching a window over them not a good idea) and actively use both of them, usually looking at one when doing changes in another.
So I wonder if I could move a child window of Visual Studio 2010 from within the boundaries of it's main window an move it to another display. Nowadays I'd enjoy the way child windows behaved (each window, incl a toolbar and a properties pane worked as an independent window on a desktop) in Borland C++ Builder (while it was senseless the days when I actually was using it).