Move a Gnome panel to another monitor in Ubuntu

In older Ubuntu releases you could ALT+drag any panel bar to another position and/or monitor. In Ubuntu 11.04 Natty you need to perform the steps from the attached article instead:

1. Right-click on the panel to access the panel properties
2. Uncheck "Expand"
3. Move the panel by dragging the grip areas that now appear on the panel edges
4. Check "Expand" again in the panel properties