I came across this excellent post on Philipp Keller's blog: Tag History and Gartner's Hype Cycles. I agree with Philipp's take that we seem to be in the area of disillusionment. The question remains, however, whether tagging really is on the rise in the way that most of us expect. Don't get me wrong, I'm a big believer and user of tagging, but most non-technical people that I know do not fully appreciate the power of tagging -- both personal and global/social. How do we know?

Tagging History

Gartner's Hype Cycle