Found this transcript from a talk apparently given on the O’Reilly Emerging Technology Conference. A number of interesting points are made on the use and implementation of folksonomies at various sites.

Though I can see the practical use on sites with a large userbase, I sometimes run intro dilemmas on how to tag a photo or bookmark. Especially now that you can bundle your tags at What becomes a bundle and what a tag. Or should I add them both? I’m still not sure on how to use this feature.