On Karmic you can now position the panels with
$ gconftool --type int --set /apps/panel/toplevels/top_panel_screen0/monitor 1 $ gconftool --type int --set /apps/panel/toplevels/bottom_panel_screen0/monitor 1
On my system this moves the top and bottom panels from LVDS to external VGA.
On Karmic you can now position the panels with
$ gconftool --type int --set /apps/panel/ toplevels/ top_panel_ screen0/ monitor 1 toplevels/ bottom_ panel_screen0/ monitor 1
$ gconftool --type int --set /apps/panel/
On my system this moves the top and bottom panels from LVDS to external VGA.