I wrote a little utility to add the same sort of feature that Windows has with the "Desktop" directory, but never quite finished it.
Basically it watched each drive's .leftout file (IIRC that's where WB stores the list of leftout icons) and whenever you "Leave Out" a new file, it links that file into a "Desktop" directory.
Mostly it was handy for quickly having access to files left out on your Workbench when you needed to load them into programs .. for example if you had a text file left out, you could get to it quickly by going to the Desktop directory instead of navigating to wherever on your drive it was actually located.
I think it would also add any files you put into the Desktop directory to the .leftout file so that they would show on the Workbench as well.
If anyone's interested, I could upload the (Blitz2) source.. but it's a simple enough program that rewriting it from scratch in C would probably be easier :-D