Simon St. Laurent – Web, meet Semantic Web:

"The key point of [Sam] Hunting's experience, which emphasized letting users do what they wanted to do, valid or not valid, was that "People really do care about tagging - they really do tag - when they get an immediate positive result." The key phrase there is "immediate positive result." Hunting showed examples of the kinds of features that users could add easily if they were willing to take the time to add some Topic Maps markup to their documents."