Some days ago, we released to the Drupal community a module that facilitates A/B Testing & Multivariate Testing through Convert.com.
Convert.com is a new generation experimenting tool that allows people with no coding capabilities to start optimizing their site.
Enable the module, go to the settings page (admin/config/system/convert), set it to ON and insert your account id. Then, you are set to go.
The module adds the Convert.com tracking code in your page's HEAD and also allows you to tag your pages using Drupal Tokens.
Finally, adds the revenue tracking js on the commerce checkout complete page, so you can have revenue as a tracked goal as well. You don't have to do anything to enable this, it is added automatically.