in ubuntu natty 11.04 with unity, there is no bottom panel any more which shows the open windows etc. this can be changed following http://askubuntu.com/questions/39069/how-do-i-use-the-gnome-panel-in-unity:
- Run gnome-panel in the terminal (Don’t close the terminal until finished with the instructions)
- A Gnome Classic desktop will appear over unity
- Remove the top panel for we can use the Unity panel
- Add gnome-panel to Start with the System.