Wow, quite proud that my initial proposal to work on individual workspace/desktop wallpapers has become a real Google Summer of Code 2008 project. It is also available as a bug since 2001.
The lucky one to bring you the bling is James Sharp.
I hope we will see some refactoring of the splattered code related to background handling and a quick and easy context based dialog to switch wallpaper on the current desktop. Being aware of multi-head setups should of course be included. In this case, the gdk monitor API surprisingly worked way more accurate than any xrandr, xinerama, X property reading stuff for me.
