Tag, You're It!
http://www.writetech.net/2007/04/tag_youre_it.html

Lentz, Michelle
Write Technology
2007

Abstract:

I was shocked today when I realized I hadn't ever written a post on tagging. At the ASTD TechKnowledge conference, when I explained Web 2.0 to a group, tagging was an integral part of the conversation. But tagging requires you to take a step back from the web, and consider how you think.