"A small Web site operator filed an antitrust suit against Google on Tuesday, accusing it of unfairly manipulating its advertising system to harm a potential competitor.

TradeComet.com, which operates a site called SourceTool.com, a vertical search engine for those seeking business products and services, accused Google of raising the advertising rates it charged the company after it realized that SourceTool was a potential competitor.
...."

http://www.nytimes.com/2009/02/18/technology/internet/18google.html?_r=1&ref=business

[Merged – Tony]

More about the topic
http://arstechnica.com/web/news/2009/02/b2b-search-engine-accuses-google-of-anticompetitive-prices.ars