Google announced that its free Website Optimizer is now available to everyone.

A software tool for testing website designs, headlines and graphics for the highest results (A/B and multivariate testing), anyone with a Google account can sign up and access the tool. While Website Optimizer has been available for those with an Adwords account, this development is simply a standalone version. Website Optimizer works with all traffic and supports an unlimited number of experiments and now features an improved setup flow for multivariate experiments.