Keyword density is outdated and is 100% of no effect. Look up LSI or latent symantic indexing to learn more about this.
The title tag, you can use the same keyword more than one, but different phrases. Exaple is "hd tv, and hd television" HD is in it twice, but relevence and exact phrase will make it easier to rank, so the keyword (singular) in the title more than one is ok if used properly.
"Put as many different keywords as you can in your meta tags." Google, yahoo, msn, altavista, alltheweb and such do not read meta keyword tags since they are link popularity engines, so that does not work at all, completely worthless. They do however work in meta search engines like dogpile, metacrawler and askjeeves, but these account for less than 2% of total internet search engine traffic and searches, so in the bigger picture, they are just as worthless as the keyword meta tags.
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