Google has launched, in open beta, its Google Website Optimizer, which helps websites test-drive various landing pages to determine which designs result in the most conversions, reports MedaPost.

Website Optimizer, released as a closed beta in fall 2006, is integrated with Google AdWords and is free to AdWords advertisers. The tool allows advertisers to receive up to 10,000 versions of a web page.

"This tool lets you have one page, add a few Java scripts and then when visitors hit the page, there are different combinations served," said Tony Leung, Google product manager.

Google considers Website Optimizer the third leg of the proverbial stool, with AdWords dedicated to driving web traffic and Google Analytics focused on measuring web activity.