Is there a A/B- or multivariate testing solution for Google Adwords ads?
terrellm: If you create multiple ads, Adwords will rotate the ads.  You can choose which ad is most effective based on click thru % or even better conversion rate if you have conversion tracking setup.Also, make sure you set "Ad rotation" to "Rotate: Show ads more evenly" under the campaign's settings so that your ads are shown evenly.