In Pictures: 7 Ways Your Site Can Be Sabotaged
 

Google Insulation

Rather than directly attack a competitor, search marketers can simply create more content and float it to the top of Google results, pushing competing sites lower in search rankings. The technique is also sometimes used for online public relations: ReputationDefender, a Louisville, Ky.-based company, creates what its founder calls "Google insulation": flattering blog entries and other benign content that floats to the top of search results, hiding online criticism that affects the company's clients.


http://www.forbes.com/2007/06/28/neg...hisSpeed=15000

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next from forbes - how to steal your grandma's pocket money without getting caught

There are a number of mainstream companies that provide this service (as well as other techniques) for brand / reputation management. Prices can start in the $50K range and can go into the millions.