Window-List Indicator (ubuntu 12.10)

 Install Window-List Indicator:
This Window-List indicator show which windows are currently open, and you can easily switch between them.

Enter following commands in terminal:

• sudo add-apt-repository ppa:jwigley/window-list
• sudo apt-get update
• sudo apt-get install window-list

After installation go to Dash and search "Window-List" then open it. Make it startup from Window-List option.

http://www.noobslab.com/2012/10/important-thingstweaks-to-do-after.html