The new tool http://services.google.com/websiteoptimizer/ Demo is availible here - explanations , with voice : http://services.google.com/websiteoptimizer/overview/index.html From what I see , the tool is geared toward real commercial sites , with set conversion goals . It's good to see that Google is also providing tools for the real internet economy(like the Checkout and this) and not just the content niche . Peace