I am running ksmoothdock on my openSuse 11 laptop.
This is running with 2 monitors in xinerama mode.
while aligned at the bottom or top, ksmoothdock fails 1/2 on the left monitor, 1/2 on the right.... not a pretty break.
The default kde panel lets you choose what monitor to display on, 1, 2, or both. something like this would be helpful.