If you're using the newest versions of Ubuntu, you probably have an annoyance or two with the Unity interface. MyUnity is a system tweaker based around changing Unity's behaviour and appearance.
MyUnity has quite a few settings in its panel, from tweaking what shows up in the dock, whether the dock autohides itself, the size of the dash, the transparency of the menu bar, showing desktop icons and more. To install MyUnity, just add
ppa:myunity/ppa to your Software Sources and run the following command in a terminal:
sudo apt-get update && sudo apt-get install myunity