you have draggable screens with http://amigazeux.net/dragon/
video here :
http://www.youtube.com/watch?v=p44mWKSjvLw&feature=relmfu
Dragon is pretty cool. It not only allows screens to be dragged vertically but also horizontally, as well. Standard Amiga screens can be dragged horizontally if the screen being dragged is smaller than the one behind it, but Dragon lets you do it irrespective.
It's a bit slow on my 50MHz 060 4000 with a PIV and P96, but works pretty damn well, anyway. It just hit me that I need to see if it allows EdPlayer to sit over the bottom of another screen the way it used to in simpler times, when a glass of lemonade resolved all problems.