See if you have the tools in your customize mode. see if you have a parcel section and the tools should be there. In the customize box from toolbars select parcel editor.
My user said the .dll usually comes as a developer sample. I had never heard of it either.
That blog post was from 2009, the toolbar is 9.3 and that parcel toolbar is most likely part of cadastral editor. So far i see no zipper tool at 10. Search customize and tell me if you can find the individual tool.
