Mixing Taxonomies and Folksonomies: A Recipe for Disaster or Clarity?

I read an interesting ebook yesterday titled The Taxonomy Folksonomy Cookbook by Daniela Barbosa of the Dow Jones Enterprise Media Group.  She's a product manager working with the taxonomy and metadata management tool Synaptica.  In this "cookbook" Barbosa argues that companies should use both taxonomies (created top-down with rigid rules) and folksonomies (created from the top-up with flexible rules) to organize their data....