Ken sent me this link to the Kart00 Metasearch engine. [1] It uses Flash to an almost pathological extreme, but you can choose the HTML (HyperText Markup Language) interface (and be careful—once you choose, there doesn't seem to be a way to change short of removing any cookies you have for their domain).
It is an interesting concept and I think I know what they're doing. When you do a search (and yes, the Flash interface is nicer; the HTML interface crashed Mozilla 0.9.9 in an endless series of message boxes) the result is a graph of the results. The size of a node (search result) is apparently directly proportional to the relevance of the search, and the connections between the nodes (the edges) are similar terms between the two pages.
For instance, I did a search for “sean spc conner” and the two largest results (one for www.classiccmp.org [2] and www.conman.org [3]) are linked by the terms “captain” and “napalm” (wonder why?). You can also remove terms from a list on the side.
All in all, it is an interesting view into search results and the ability to remove terms is quite nice (and can give dramatic changes—for instance, I removed the terms “captain” and “napalm” and the resulting graph was completely different with no one node dominating and the big result from the last search, www.conman.org [4] isolated and not connected to any other node).
[2] http://www.classiccmp.org/mail-archive/classiccmp/2000-02/0287.html
[3] http://www.conman.org/people/spc/