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I'll make this statement: meta keywords is a signal. One of roughly a thousand we analyze.
Getting it right is a nice perk for us, but won't rock your world. Abusing meta keywords can hurt you.
SEO for Bing - a discussion with Bing's Duane Forrester [webmasterworld.com]
I have never quit adding relevant keywords to the page.Same here. I have found some link directories and other sites make use of them to contruct tags and crosslinks. In some cases multiple backlinks from one submission were the result.