That is the question. For those of us that love DATA and INFORMATION, tagging gives us a way to easily CATEGORIZE and ORGANIZE the massive content on the web.
So long keyword searches. TAGGING enables us to organize web material in a very personalized way, rather than relying on pre-existing formats of classifying information. (goodbye dewey decimal) Tagging is great because it's USEFUL to the tagger, making the mose sense of organization given the organizer is in charge of the system.
Just look @ the popularity of flickr, youtube, and del.icio.us. I've been using del.icio.us for awhile... the benefit, access 2 my categorized BOOKMARKS - anytime, anywhere. aka: any computer, any browser.
I found this article really interesting. Especially when Weinberger was talking about the potential intersection between tagging and our social networks. WOW. The power of data.