Do you want enable Unity Launcher to automatically hide in Ubuntu 12.04? Well, this brief tutorial is going to show you how to do it. When you upgrade or install Ubuntu 12.04, the launcher is docked on the left and won’t auto-hide. Enabling it will give you some more space to work it.
via Automatically Hide Unity Launcher in Ubuntu 12.04 Precise Pangolin | Liberian Geek.