One significant advantage that Selenium seems to have is that it accepts CSS3 selectors as target element patterns. Chickenfoot has XPath, but not CSS3. A bit of a bummer because this otherwise looks like it will be fun to play with.

I use Selenium regularly and while it is exceptionally useful, it's also quite buggy. I heard mumblings some time ago about Google contributing to the Selenium project or even forking it, but I'm not certain what's happened there.

I created the Selenium project 6 years ago. These days, I'm working on my own Selenium-based startup, Sauce Labs ( http://saucelabs.com ) -- We offer commercial support for Selenium and have a cloud-based web app testing service, too, called Sauce OnDemand.

Regarding Google, you might be thinking of the on-going merger between the Selenium and the WebDriver projects. WebDriver was created by Googler Simon Stewart. He currently works at Google, but WebDriver was created when Simon was still at ThoughtWorks. Also, I am a former Googler (and former ThoughtWorker), and worked on Selenium during my time at both places.