Great piece of software!
Works very well... only (at this time) sometimes a little buggy;
-When I change dock, sometimes it won't change right away, although it displays so. So I have to select the previous dock configuration again, and after that try again.
-The dock often changes really slow, visually. Then I have to wait about 5 or 6 seconds before the dock appears. (Even on a iMac G5 with 10.4.2/1.8GHz/1GBram!) Maybe that's being caused by the dock configuration ('hiding' being turned on p.e.), or by dashboard being changed too, what is - of course - a great feature.
Anyway: 'Dockyard Manager' is a great new application!