Remember Borderless Elementary? It was quite a success and I'm not sure if that's where the Ubuntu devs got the idea from, but update today in Ubuntu 11.04 removes the borders for the Ubuntu "Light" themes:

There's a lot of catching up to do, and I'll start with the updated Light Themes package which landed in Ubuntu 10.10 Maverick Meerkat while I was away. To make it easy to install for everybody still using Ubuntu 10.04 Lucid Lynx, we've uploaded the Ubuntu Maverick version to the WebUpd8 Light Themes PPA.