"Vista has one desktop. This fact is so ingrained in Windows
users that the very concept of an alternative desktop is often hard
for them to imagine. Yet GNU/Linux offers at least a dozen. Besides
the popular GNOME, KDE, and Xfce desktops available in most
distributions, you can also install ones like LXDE, ROX, or
keyboard driven ones like dwm or ratpoison.
"With many desktops, you also have several dozen choices for the
window manager -- the application that controls the appearance and
position on the desktop. With each window manager, you get a
different look, feel, and performance, and you can use many, such
as IceWM or FluxBox, as stripped down graphical environments."