Adding to their already good collection of free tools, Google has publicly launched their Website Optimizer tool. The purpose of the tool is to let site owners create different content for their pages and using the provided Google API, change those pages on the fly and see how users react to them. You can change text, images or whole sections to see what works best for you and your customers. The tool then provides nice charts and graphs showing the results.
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Do you have a link for the website optomizer?
I’m also interested in this website optimizer. Do you mean the Google Webmaster site?