Dhiti (http://dhiti.com) creates a magical window to explore a site. We surface concepts related to content, we also help surface the interconnections between concepts. The user could interact with these concepts to discover more.
Our messaging video http://www.youtube.com/watch?v=bTcdZcHBR2g
Find Dhiti in action in the following links, scroll down to the end of the article content just before the comments starts.
http://thenoisychannel.com/2011/02/05/google-vs-bing-a-tweetle-beetle-battle-muddle/
http://www.dancingmango.com/blog/2011/01/25/guess-who-kill-the-agile-buddha/
Thanks