Open Thumbshots Project
A very interesting and usable information - a small preview (thumbshot) of a webpage - allows users to visualize links and go deeper into the directory with the help of
thumbshots.org. This is a kind of usability optimization. In order to keep load and download time small the service makes use of image optimization. The images are delivered in the jpeg-format, and most interesting, they deliver the images with Content-Encoding: gzip. Don't know whether this form of double compression makes much sense i.e. savings.