Originally Posted by WiredGuy

You see this as a bad thing where I see this as a great thing. This is a great way to see exactly which password sites are indexing your sites so you can prevent them in future. Google isn't the problem here, its the password sites. Google is telling you exactly which sites is contributing to the problem. To me, this is a good thing. Just grab a list of all the password sites that google returns and setup a mod rewrite for all referrals to a landing page. I do of course think a password protection script is also needed on top of this.

WG