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Identify and actively report those sites/links to Google. Here are some links to help understand and to report your issues: http://www.seomoz.org/blog/negative-seo-myths-realities-and-precautions-whiteboard-friday http://googlewebmastercentral.blogspot.com.au/2010/11/how-to-help-google-identify-web-spam.html http://www.mattcutts.com/blog/calling-for-link-spam-reports/ https://docs.google.com/spreadsheet/viewform?formkey=dEVxdmdRWFJRTjRoLWZVTHZkaTBQbkE6MQ http://support.google.com/webmasters/bin/answer.py?hl=en&answer=164734