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Firefox Version 4 is the default web browser that ships with Ubuntu 11.04. As you can see the web browser menus appear in the top menu context navigation area, a la Mac OS X.
Virtual desktops can be paged through using the Unity Taskbar. Applications in the Taskbar automatically zoom to the correct desktop they are running in when selected.
The Windows or "Super" key brings up the main search interface which allows you to find applications and files on your computer.