More than ten U.S. Internet Service Providers (ISPs) have apparently been caught hijacking search sessions. Crazy:
"When the user initiates searches for specific keywords from the browser's URL bar or search bar, the proxy no longer relays the query to the intended search engine, but instead redirects the browser's request through affiliate networks, as the equivalent of a click on advertisements."

More info at http://www.newscientist.com/article/dn20768-us-internet-providers-hijacking-users-search-queries.html

Added: To protect yourself against this, you can search Google via SSL search at https://encrypted.google.com . It might also help to change your DNS provider. Google has a Public DNS service: http://code.google.com/speed/public-dns/ and OpenDNS has one too.
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