Cnet: Customers rage at Google tweak

In a rare sign of trouble for the booming search marketing business, Google is fending off complaints from angry customers who say recent changes to the company’s advertising program are costing them sales.
The search engine giant tweaked its AdWords service in late October, saying it was making the move to better identify successful ads–those that get clicks–and to increase their visibility. It also took steps to reduce the number of unsuccessful ads that show up on its search results pages. A company spokesman said overall ad response rates have improved since the changes took effect. (full story)