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badp has created a data explorer query that shows at-risk tags: tags that are used on a single question and have been around for at least 3 months. I reviewed the first 25:
Required tags (name of the author or movie): john-steakley mercy-thomson eric-flint bridge-to-terabithia venture-bros jack-mckinney jean-m-auel godslayer land-of-the-lost the-giver the-prisoner emberverse clockwork-orange 1001-nights green-rider quiet-earth person-of-interest l-ron-hubbard k-pax mst3k fantastic-voyage
Optional tags (name of the book where there is also an author name): armor-book painted-caves
Tag that should have been different: quantum-thief (name of the title, we would normally use the author name — however this is a retag of a tag that had been deleted previously, so we can't know what was there befoere)
Tag that makes sense, but isn't a great loss: aladdin (it's a concept tag, which we encourage, but it's a very searchable one, so it isn't particularly useful)
Tags that we should get rid of: none
So that's 21 against the tag killer, 4 undecided, and 0 in favor. Kill the tag killer!