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Robert_Charlton - 10:01 pm on Sep 4, 2008 (gmt 0)
The last time I heard it described by Yahoo, Yahoo uses them as a last option... ie, after it's looked at all other web content and found nothing, it will then reference words that appear in meta keywords tags. Otherwise, the meta keyword tag, IMO, is tooth fairy stuff.
...because Yahoo uses them and I can rank for synonyms and phrases that I do not wish to include in the text content of my page.