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Google brags about intelligent indexing, so you have to contend with that. You can restrict certain sites from advertising thru Adsense...but at this time ya couldn't just auto-determine yourself.
Its all about contextual relevance.
Example:
Build a page with 100 indexable words on it.
10 of them are your focus.
The other 90 words shoul stand on their own and if you remove the 10 and leave blanks...anyone reading it would be able to guess what the word is.
That's becoming contextually relevant and Google states that they will display ads based upon your page/sites contextual relevance.
Some food for thought!
Hope this helps get your ads more targeted.
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