I tried "web 2.0" in Google and received 517 *million* hits.
I chose "web 2.0", tried a simple guided keyword search and got 388 hits. They were scattered all over the place. I got titles on the Eisenhower roadway system, national forests in Arizona and the like in addition to titles on web 2.0
Tried a subject search in Equest and got 0 hits.
The parallel between between the catalog and tagging is that both describe the object and are intended to make retrieval easier and more efficient. The difference is that tagging is assigned by "real" users and isn't part of a controlled vocabulary. It trades ease and breadth of searching for precision, so the searcher needs to be aware of that caveat.
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