install mac style dock menu in ububtu

To install this type

sudo apt-get install avant-window-navigator awn-manager awn-applets*

or

yum install avant-window-navigator awn-manager awn-applets*

in the terminal. Its done. u can see the dock menu application->accesssories->awant window manager.
Try this which is really cool one to have in ur desktop.

Credit: http://www.hackourlives.com/?p=750

once its started the dock menu then right click on the menu click'dock preferences'.
Here, check the checkbox in General-> Start up behaviour -> Automatically start.
Then confirm yes

its done. Next time the dock menu will be launched automatically.