Here is a bookmarklet you can use you browse or spy on an Optimizely customer's experiments!
javascript:window.jQuery && jQuery.getScript("//gist.github.com/optimizelyspytool/7a7f573ec1657fb7db97/raw");
(highlight and drag this to your bookmark bar on your browser)
Since all of their experiment code is made publicly available in the javascript library, rather than server-side decisioning, it's all waiting to be browsed!
I saw a site made by the guys over at http://nerdydata.com but has since been removed.
Post any interesting finds using the tool!