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A long long time ago I remember someone doing an experiment adding nonsense phrases in keywords tags to pages to see if there was a cut off point for which keywords were ignored and didn't rank. It was claimed that the the first 12 keywords ranked but the rest were ignored.
These days most people agree keywords won't help improve your rankings, but I'm sure that they can harm your rankings if you abuse them. I don't use them at all actually, but when I'm forced to I make them, unique on every page, as succinct as possible and relevant to that page. So on a sitemap page my keywords would be "Company Name, sitemap" and so on.
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