What is an acceptable density for a keyword? It's wise to push it as close to spam without sacrificing user experience, correct?

I read an article on SeoMoz (outdated I think) that mentioned 6%.

If it's a keyword phrase, do you have to make sure you don't go over the density level of a particular word in the phrase. If it's a three word phrase, do you have to not use any one word more than X% or just monitor the exact keyword.

Thank you! I hate when people try to obfuscate SEO.

If I relied on kick ass business and natural link building no one would pay me $100 an hour. Probably because they would be 30k in the hole before they hit front page.

I do however lean away from explaining my practice to clients. I don't want them to replace me, right? I am transparent and above board, but I don't explain the process...

Francisco is giving one of those partial truths. I am sure it was intended to confuse the poster in thinking, I am doing that and getting no where! Perhaps I will pay this guy that knows how to do what I do better...