n00bs on Ubuntu posted a tip about hiding the left launcher panel on Ubuntu 11.04

You can make some small changes to the left launcher panel using the Ubuntu Unity Plugin. You can change the way the panel is hidden (never, Autohide, Dodge Windows or Dodge Active Windows). You can also change the way the panel or icons are highlighted when clicked on.

  How To Hide The Left Launcher Panel On Ubuntu Unity 11.04 Natty Narwhal