There is also http://abtests.com/ http://abtests.com/ which is an interesting take. Though they limit to two versions and don't offer that many insights. Plus,

There is also http://abtests.com/ http://abtests.com/ which is an interesting take. Though they limit to two versions and don't offer that many insights. Plus, if you are particularly interested in A/B testing case studies, we have A/B IdeaFox: a search engine for case studies - http://visualwebsiteoptimizer.com/ideafox.php http://visualwebsiteoptimizer.com/ideafox.php