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Thanks for the help - my gut tells me that I shouldn't have to do it for every possible iteration that could be generated.

So if I redirect the root url and Google has already indexed interior pages using the non-www url, will Google (et al) systematically revisit all the old links or start again at the root directory and have the (no longer) duplicate content just fall off the results pages and stop impacting my relevance?

I just ran my first diagnostic and one of my primary immediate problems are duplicate titles and duplicate content. My guess it that because the root URL http://sitename.com (which has not yet been redirected to www...) has generated an entire tree of content which is identical to the tree rooted at http://www.sitename.com.

QUESTION:

Do I need to do a redirect simply for the root url (sitename.com -> www.sitename.com) or do I now need to develop specific 301 redirects for each of the sub-nodes/pages?

ie

sitename.com/?q=about-us -> www.sitename.com/?q=about-us

sitename.com/?q=our-team -> www.sitename.com/?q=our-team

etc.