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You are only really going to get to grips by experimenting and observing the SERPs. I am sure if you go though these forums you will pick up some gems which you could apply.
Have you seen the keyword density analyser ?
[searchengineworld.com...]
Use that and you can quickly see if you are approaching spam with some of your words. It does not grade the words (title, H1 etc)but show what a spider would see. As every engine will have their own algos there is no one generic approach.
There was a post on this recently, but I cannot find it. I am sure someone else will chip in.
Cheers
[edited by: ukgimp at 2:05 pm (utc) on Aug. 15, 2002]