Google Website Optimizer, a powerful tool that allows website owners to split traffic and test the effectiveness and conversion rates for an array of variables, has traditionally required a lot of back-and-forth between any given site and the Website Optimizer interface.
via readwriteweb.com
Google releases an API and is allowing site owners to conduct multivariate and A/B testing from their own platform. I'm not sure how well does it compare to Mixpanel or similar products, but I'm planning to find some time for it.
