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How Google Alters Search Queries to Get at Your Wallet
(www.wired.com)
This is a most excellent place for technology news and articles.
I think shopping part of google search has the same problems as the rest of it just more so - there is a fundamental disconnect between searchers wanting neutral results and producers paying google to direct customers to their products. The more ability you have to control your search the less ability they have to sell highly ranked search results to advertisers.