Note that Ubuntu users can be easily detected by their user-agent. Just check the user-agent string for ‘Ubuntu/’. Maybe we could put a ‘Friends of GNOME’-like banner on planet.gnome.org, www.gnome.org, and so on and politely request users to install a plugin/package to give the revenue back to the GNOME foundation again. The plugin could do this for Banshee, Amazon, Firefox Google search, etc in one go.