Just looked up a search phrase, that according to inventory.overture.com, is being searched up over 10,000 times a day, yet wordtracker only shows under 100, and when testing on google adwords with $5 bid it showed me less than 1 click per day. Do I really want to research this keyword further, or is that an obvious large error? I know overture is rather unreliable, but THAT big difference really surprised me.