Ubuntu has pretty impressive collection of docks available. The following docking applications are available out of Ubuntu hardy repositories which you can install right away. Following section covers each and every beautiful dock for ubuntu.
AWN - Avant Window Navigator
Awant window manager engine has two modes of operation one is Glass engine and the other one is pattern engine. Using glass engine you can apply arbitrary color gradients for background of dock. Where pattern engine allows you to apply images as dock background. Avant window manager works sort of like taskbar or opened window list. You can drag and drop things on to dock. Can also do pretty good transformations like bouncing & fading icons.
Install Avant Window Navigator, Extras & applets by issuing following command.
sudo apt-get -y --force-yes install avant-window-navigator-trunk awn-manager-trunk awn-extras-applets-trunk
Now run following command to start Avant Window Navigator.
You can change theme and other settings by right clicking on any empty area of Avant Window Navigator dock and selecting Preferences. To get 3D perspective look goto General > Bar Appearance and change the settings Bar angle, bar height & Icon offset.
Download Awant Window Navigator Themes.
Cairo dock packs up when its not in use. So it won't distract you while you are working on some thing else. It also works as opened window list as well as quick launch for frequently used applications.
Install cairo-dock by issuing following command.
sudo apt-get -y install cairo-dock
Gnome DO is a popular application launcher for linux and its latest version has a docking feature called docky. To install latest version of gnome do add following repos to your sources.list file.
deb http://ppa.launchpad.net/do-core/ppa/ubuntu intrepid main deb-src http://ppa.launchpad.net/do-core/ppa/ubuntu intrepid main
Now execute following command to update your repos.
sudo apt-get -y update
Execute following command to install gnome-do
sudo apt-get -y install gnome-do