Information professionals have long debated the relative merits of using keyword search versus doing some indexing of key terms - and should those terms by user selected (the tagging we know from delicious) or applied from controlled vocabulary? These issues get picked up in this article in which the author concludes, "Some heavy lifting up front to structure and tag the metadata will greatly optimize the search, retrieval and interrogation of the results for end users."
Using metadata well for indexing depends on planning for development and user access, and making definitions clear. Of course, governance and stewardship are two important principles in maintaining metadata that can be easily used and which will do the job of assisting in retrieval.
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