Ubuntu Newbie Guide: Compiz, How to Get the Cube and Mac-like Dock Bar (Avant Window Navigator) [part 4]

Before installing Ubuntu, almost everyone has seen the spinning cube or the classy MacOSX-like dock bar and many other effects (4 desktops with 2 caps) in some videos, but some didn't figure out how to enable/install/use them.

To understand better, this is the dock (look at the bottom of the image):