Ok guys, I am happy to say that I have created a rudimentary script to save desktop arrangements as well as restore them.

Wallpapers arent working now due to a small bug somewhere. But icons and widgets are restored to their positions.

Things left to do:
# get and restore no of desktops enabled from gconf.
# Get individual widget settings (might have to do for each widget. Is this practical?)
# Investigate how icon sizes and icon background settings are stored.
# QBW widget importing. Right now i believe it just restores your own QBW widgets.

BTW, I got a lot of very useful code from the Desktop Activity Manager app. So a lot of thanks go to that developer. I will try to upload the basic version when I reach home tonight.