As usual, DockBarX is available in the main WebUpd8 PPA for Ubuntu 10.04, 10.10 and 11.04.
It also works under Ubuntu 11.10 but not as a GNOME3 panel applet.
Add the PPA and install DockBarX 0.44 using the commands below:
To also install the Avant Window Navigator DockBarX applet, use the following command:
Then, to use DockBarX:
For configuring DockBarx, a new "DockBarX Preference" entry should be available in your menu.