How do you move the Unity Dash with a dual monitor setup?

I'm using 2 monitors with Ubuntu 11.04 and can't for the life of me figure out how to move the Unity Dash/Taskbar/whatever to where I want it (the far left side of the left monitor). No matter what I do it remains on the left side of the right hand monitor. Has anyone else figured out a way to achieve this?

Solution 1:

The Unity launcher only appears on the primary monitor. You can adjust the monitors in the Monitors application (available from the Dash) to reconfigure your monitors accordingly.

Solution 2:

This can be set by adding the line to xorg.conf. Take attention to select desired monitor's section.

Section "Monitor"
...
    Option    "Primary" "true"
EndSection

I can confirm this worked for me with ATI Radeon card + manufacturer's driver: Catalyst 11.9 (Ubuntu 11.04). Maybe also applicable under different configs.