does any one know Google WebsiteOptimizer tool, how it works?

http://www.google.com/websiteoptimizer/tour.html

Will this effect ranking?

 

Not directly, it is a way for you to do A B testing on your website fast and easy. So by using this, you will hopefully get more happy customers/users. And with more happy users, more natural links (they do exist) and therefore better SERP

 

Here is the tutorial page of google about it: http://www.google.com/intl/en/websiteoptimizer/tutorials.html

 

thx you tobic