I worked at Dzone.com for a while. It is, at first glance, a link sharing site for programmers.
Working within the DZone’s previously established design principles, I designed this sidebar that is meant to keep users engaged even after clicking a link and leaving the site. Often users would click a link and leave the DZone with no means of leaving feedback on the link for other users. This sidebar allowed users to review a link while actually looking at the page and listed other links, perhaps in the same category, for users to continue to explore.
This concept was never used, presumably because it allowed users to explore too much without seeing ads. DZone was all about ads at the time.