In Ubuntu Natty, the Ubuntu desktop guide (f1 option from desktop). When you highlight 4 out of the 5 top links it shows a screenshot of gnome-shell and not of unity this could be confusing for new users.
I was going to raise a bug for this but don't know what package it belongs to.
the links affected are: start applications windows and workspaces logout, power off and switch users overview of the desktop.