HitTail was named one of PC World’s Best Free Services for Business this year so it’s worth a look. This is a free tool for organizations that see less than 100,000 website visits per month.
HitTail reveals in real-time the least utilized, most promising keywords hidden in the Long Tail of your natural search results. HitTail’s software will provide you with suggested search terms that you can use to update existing content, or you can create new content to address under utilized search term opportunities.
The end result - more traffic to your website. See the HitTail Demo for more information on this free service.