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EG: A how to site that shows tutorial of the day on the home page.
To avoid the dup content should this be set to change every day or week?
The site gets crawled once or twice a day.
The best thing to do for this type of situation is to check around for other sites have similar setups and see how they rank in the search engines.
Usually the worst thing that can happen is one piece is selected over the other for the search engine results.
Also, there are a few great threads around here with similar type questions regarding duplicate content.