On NETTUTS.com today there's a new tutorial showing you how to create a split testing environment in your WordPress installation with the help of the Google Website Optimizer plugin.

Split testing is a way to experiment with a live site and find which headlines and text are the most effective. Amazon uses split testing to determine which versions of their site convert customers better. We’ll use WordPress and Google’s Website Optimizer to test two different headlines, and find which works best at capturing customer emails.

They walk you through their six step process to help you create the pages for testing, install the Google plugin and use the Web Optimizer tool to keep track of the results of your testing.