Hello
I would like to suggest Viart add the Google's Website Optimizer.
What is Google Website Optimizer ?
Website Optimizer is a tool that can help you improve the effectiveness of your website in getting a return on your investment. By allowing you to test different versions of your site content, you can determine what will best attract users and lead them to convert on your site.
Website Optimizer allows you to test changes in the website content of your pages in order to determine what will be most effective in getting conversions. You choose what parts of a page you'd like to test -- headline, image, promo text - and we'll run an experiment on a portion of your site traffic to determine which content on your site users respond to best. When we've collected enough data, we'll provide you with reliable reports and a suggested course of action in order to optimize your site for maximum business results.
Here is a video of Google's Website Optimizer:
http://www.youtube.com/watch?v=XJT9TCqzw4U