[ Thanks to kiterunner for this link.
]
“GNOME Shell is a new completely revamped user
interface for GNOME. GNOME Shell brings a new window manager called
Mutter which is a combination of Metacity and Clutter. This
reportedly makes Compiz unnecessary(and incompatible too).“What is Gnome Shell and Why?
“GNOME Shell is a component of GNOME 3.0, the next generation of
the GNOME desktop environment scheduled for release in March 2011.
GNOME shell controls the management of the desktop and breaks from
the desktop model used in previous versions of GNOME.”