"From today, only the new user interface will be available (http://google.com/webmasters/tools)! You'll see that in addition to fixing many of the issues users addressed, we took some time to launch a new feature: Change of Address. The Change of Address feature lets you notify Google when you are moving from one domain to another, enabling us to update our index faster and hopefully creating a smoother transition for your users"

http://googlewebmastercentral.blogspot.com/2009/06/out-with-old-in-with-new.html

And this is the result of Matt's little experiment?