Muddiest Point for Week 2

We talked about suggested a controlled vocabulary for tags on delicious.com in order to maintain a consistency between different users. This seems like a good idea, and is also talked about a bit in the Galloway article. What I would like to know, is if there is a way to create new tags consistently? That is, can you suggest a way in which new tags would be able to become standardized within the user community? Alternately, should a site like delicious follow the Historic Pittsburgh website and adopt an existing subject thesauri like the Library of Congress Subject Headings?