The Production Z Editing toolbar was a great addition in v9.3. It made editing and snapping in the Z domain practical and quick. This should be a standard toolbar in ArcGIS. The production Z Editing toolbar in ArcMap did the job very well. The Z snapping tool and the ability to trace and pick up a Z surface while you did it was one of the more functional tools I have used. I can not understand why editing Z data in ArcGIS is so difficult when there is a group of tools there to make it very easy.