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tedster - 1:05 am on Sep 20, 2006 (gmt 0)
Yahoo does look at the tag (at lest they used to) although it has little influence in the algo. Their recommendation, as I recall, was to use it for alternate spellings.
The meta keywords tag is almost universally ignored by today's search engines. But if you're going to use it (and I still do) the keywords should NOT be universal but specific to each page. I put in the important keywords I hope the page will rank for as a kind of "memo" for the future.