This is not Ubuntu specific (as I no longer use Ubuntu) but will Docky ( http://wiki.go-docky.com/index.php?title=Welcome_to_the_Docky_wiki ) which is in the Ubuntu repos run on gnome shell? I know it requires compositing which is provided by mutter.
Shell – Will Docky run on gnome 3 with gnome shell
gnome-shellgnome3
Best Answer
"A picture is worth a thousand words..."
Picture shows Docky running in Gnome-Shell in 11.10