What is Google Website Optimizer (GWO), you might ask? It is Google's free website testing and optimization tool, which allows you to increase the value of your existing websites and traffic without spending a cent.
It's a powerful tool that allows you to test various page concepts directly on your visitors and see which of your ideas works best in practice.
Using Website Optimizer to test and optimize site content and design, you can quickly and easily increase revenue and ROI whether you're new to marketing or an expert.
Magento came up with an easy integration with Website Optimizer in the admin panel. In Magento 1.4 version, we can test the conversion rate for the following pages: