This is a sequel toGnome 3 and Shell - A Complete User Guide [ Part 1] [11] and Gnome 3 and Shell - A Complete User Guide [ Part 2] [12]. Gnome Shell is like the Dead Man's Chest in the movie, Pirates of the Carribean, its ugly and hidden in a distant land, but once you find it and unlock it, you will have the complete control over a invincible ship. The key to make Gnome Shell "invincible" is the Shell extensions.
[13]
http://ubuntumanual.org/posts/414/gnome-3-and-shell-a-complete-user-guide-part-3-shell-extensions [13]