Moblin
Ars Technica has an article on Moblin, a Linux-based OS for Netbooks and mobile devices. The article points out innovative new UI ideas such as "zones":
Applications are organized into "zones," which are loosely analogous to virtual desktops. When I launch an application, the shell will automatically create a new zone in which to house the program's windows. When all of the windows in a zone have been closed, the shell will automatically remove the Zone. The zones tab on the Moblin panel will display thumbnail previews of all of the windows in each zone. You can switch to a certain zone or window by clicking, and you can move windows between zones by dragging and dropping the thumbnails. The zones tab in the shell is Moblin's replacement for the conventional taskbar.
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