As we rapidly approach the holiday shopping season, advertisers are ramping up promotions, holiday campaigns and focusing on maximizing return on investment (ROI). An important aspect to success is optimizing your keywords and ads. Users will see your ads while you bid on the keywords that trigger which ad to show. Often times, we receive feedback from advertisers that campaign ROI is high and they would like to increase ad delivery. A great tool to increase ad delivery is Microsoft’s Advertising Intelligence.
http://community.microsoftadvertising.com/blogs/advertiser/archive/2009/10/26/tutorial-using-microsoft-advertising-intelligence-s-keyword-wizard-for-keyword-expansions.aspx