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The guy from Google did say that they were striving to put more emphasis on semantics going forward. I am seeing this...I know longer have to put as much emphasis on widgets and widget.
My advice, write a lot of content about one subject and you will probably cover all of your bases without even trying. Some pages will naturally be longer than others, keyword densities will vary, and you'll probably use all types of synonyms and related phrases. Ultimately, this will make you less susceptible to changes in the algo's.
Good Luck!
Thanks again,
Hungry4SEO