They grow up so fast, don’t they? Today at ad:tech in San Francisco, Google announced that its multivariate testing tool, Google Website Optimizer, was coming out of beta and getting its own digs. Here’s the official announcement.

Up until recently, the only way to use Google’s free tool to test and improve your website’s content was through a tab in AdWords. Now that Google Website Optimizer has moved on to the big leagues, it has a new standalone website independent of AdWords, where you can log on and start running tests right away.

Here’s a look at the new multivariate walkthrough:

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Read on for a list of new improvements and support options…

Congratulations to the Google Website Optimizer team! This is a huge step forward for scientific design. Now there’s no excuse for website owners: you can improve your site’s content, you can do it for free, and you don’t even need to have an AdWords account.