There's a new and interesting tool out there. ClickMuse has launched AdWords Optimizer, aimed at improving your Google Adwords campaigns. The idea is that ClickMuse will monitor your AdWords ads and alert you when one ad begins outperforming another.
By signing up for an AdWords Optimizer account, a daily report will be sent, detailing the performance of your ads. When one of your ads is deemed in need of optimization, a link to another report will be sent for your review. ClickMuse claims to be able to cut your AdWords maintenance time by 60 percent, so it's probably worth checking out.