The days when I Modded the Desktop. This is what happen when someone is bored.
The Bar below is actually awn, avant windows navigator, Look Deceptively like apple doc, which actually not, I look like one, it is function more like a taskbar, Which all sort of plugin.
To run awn, you will need to have compiz. It is actually a prerequisite.
The installation guide is here. http://www.ubuntugeek.com/howto-install-avant-window-navgator-in-ubuntu-gutsy-gibbon.html
Note, it is very ubuntu specific, and need a lot of command line, which scares a lot of user. And yeah, install the extra plugin too, it look a lot nicer with it