Take a look at the integration in action:
Link to video
If you want to learn more about how you can use Magento and Website Optimizer together, we're doing a joint webinar next Wednesday, 12/3, at 9:30am PST. During the free webinar, we'll provide some tips and tricks for using GWO on an ecommerce site. We'll also be doing some live landing page critiques. If you want your page to be considered, leave a comment here. You can register here for the webinar. Hope to see you there.
[NFGB] Link - from Official Google Website Optimizer Blog