I'd love to be able to shrink my windows turn them into icon size-ish (64x64 or
128x128), and place them on my desktop. I think removing window decoration would
be a good idea also for this. Once shrunk the icons should be excluded from the
alt-tab switcher and also the expose switcher (possibly also the panel). 

This is ideal for things like calculator, bittorrent, and other utility
applications which are used frequently but take up space in the taskbar when
minimized.

Related would also be to shrink windows arbitrarily, maybe with control+wheel
up/down, and keep the decorations, until the windows reach a minimum size which
is ~= to the icon size where upon the window will become an icon.

If this were to be combined with fading it would be possible to take a window or
a group of windows and make it appear as if they were fading into the distance,
as a feature this can be expanded in many ways possibly as a replacement or
addition to the cube workspace switcher with more of a walk through style
workspace switch (similar to the OSX dashboard) think groups of workspaces on a
cube face and that kind of thing.