Show all open windows in 11.04?

Super+W can do it but if you want to add Mouse Gestures to it, Like Gnome 3 you can do the following:

(as pointed out in comments)

• Install Compiz Settings Manager

• Run it, Go to Commands under General

• Set Command 0 in Edge Bindings and come back to "Command" tab

• Enter "xdotool key Super_L+w" in Command Line 0

• Install package xdotool

Install compizconfig-settings-manager.

Then

scale plugin > bindings - initiate window picker or initiate window picker for all windows, choose the edge binding

use the window symbol + W this will show all open windows