freejung - 10:10 pm on Jul 21, 2010 (gmt 0)
As for the technical details, on the page you get once you click on the thumbnail, they are hotlinking the image and loading the page in an iframe, so you will get a hit from the image load and also a normal pageview from loading in the iframe. The close box for the popup and the faded area around it are just a straight link to the page.
As for the results pages, it's harder to tell because they are scripting the whole thing and the code is non-obvious, but I don't think they are hotlinking the images there. It looks like they have their own version of the image resized to their specifications, which would be the way to do it to maximize speed.