Here's a Tech Bulletin from NGK on the subject. They state that all NGK plugs have a metal plating on the threads that acts as an anti-seize and nothing else is necessary, and in fact can cause problems. Some recent threads on this BB have shown a diversity of opinions and techniques regarding the use of anti seize.
NGK says only plugs with no coating would benefit...here's their bulletin:
http://www.ngksparkplugs.com/pdf/TB-0630111antisieze.pdf
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Bob: son's XC70, dtr's '94-940, my 81GL, 83-DL, 89-745(V8) and 98-S90. Also 77-MGB and some old motorcycles.
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