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Ubuntu Linux 11.04 now uses the "Unity" user interface, which features a prominent "Task Bar" on the left hand side that acts as both a task manager in addition to a common application launcher. Shown on the desktop is LibreOffice Writer, the word processing program that comes with the new LibreOffice productivity suite which replaces OpenOffice 3 in previous versions of Ubuntu.
See also Jason Perlow's full report, Ubuntu Linux 11.04: A whale of changes for Canonical's user base.
Nautilus is still the default file manager although it now uses the context-based menuing system in 11.04.
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.