That's awesome, thanks .. how does it work? I mean why does it allow google to bypass their paywall.

Because google does not like to index pay-walled articles. They are either not indexed at all, or given a low score. This makes complete sense because Google wants their users to be happy and users are usually not very happy when they hit a pay-wall.

Online publications, on the other hand, really want their paywalled articles to be indexed by Google. You may remember Murdoch did a lot of complaining about this a couple of years ago. So now publications do a little trick where they make the whole article available to people coming from Google but offer a paywall to anyone else. This means that you can usually access the entire article if you are redirected from google.

Interesting, thanks. It seems counter-intuitive that they would allow all users from google to see the full article, since that's where you'd imagine a lot of traffic would come from.

So that google doesn't knock them down in ratings or outright delist them.

cool, just turned it into a bookmarklet http://paywall-killer.blogspot.com/