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Currently when you move a window past the edge of the screen you can set KDE to move that window, and your view, to the next desktop. I think this idea can be considerably expanded to allow for a much wider variety of interactions with windows. Currently windows 7 has two such interactions, shaking a window to minimize/maximize other windows and moving a window to the edge of the screen (but not past it) to maximize the window vertically. But these are very rigid and still much more limited than what I have in mind. Further, with the alt+drag window movement in KDE I think this idea can be much more useful than in windows, since you don't have to go to the window title bar to move it.

The sort of interactions I think could be assigned to various actions:
Move window to an edge of the screen
Move window past the edge of the screen (this is the only one that KDE currently has)
Move window to a screen corner
Shake window horizontally
Shake window vertically
"Toss" window (click, drag, and release while dragging)
Move window in clockwise circle
Move window in counterclockwise circle
Arbitrary gesture (similar to the input actions the mouse gesture system)

So for instance you could set it move a window to a neighboring desktop by tossing the window in a certain direction, or set it to maximize the window along one edge of the screen by tossing it, depending on your preference. Moving the window in a circle would be a potential way to move it to the next or previous desktop, grow or shrink the window by some amount, change its opacity by some amount, or various other increment/decrement functions.

This would be really nice and would make UI more intuitive.