TheMadScientist - 9:10 pm on May 14, 2011 (gmt 0)
It's their web preview ... I guess they think it's cool to break protocol and standards when it comes to making their visitors happy and possibly keeping them on their site rather than just saying 'this site does not allow previews' and sending them to the site in the results.
They're actually making the request too ... The system checks for an X-Forwarded-For so if they were 'proxy requesting' for visitors that click on the preview it should show the visitor's IP Address, not theirs.