It would be great from both the usability view and the view of power users
to have the ability to have a different Desktop for each Workspace.

To not confuse new users, this could be done that, by default on all
Workspaces you have the same desktop. But that you have the possiblilty to
change that for each desktop.

Maybe this could be implemented when the name or number of the Workspace is
appended to .gnome-desktop

like .gnome-desktop-1 for the first Workspace maybe.

The point is that you could have then 1 Workspace for Office Use another
for Funny stuff and yet another one for Development for example, each with
it's own Background and own Desktop Shortcuts. I think I'm not the only one
who would like this, as many people asked me if this is already possible.