Danny Ayers spotted Grokker, a very cool search-results organisation tool with an online demo applet. Here's an example search. After a few minutes playing with it, I thought the results were good on precision (the returned hits were relevant, and the sorted categories were all nicely cohesive), but not quite so good on recall (percentage of relevant results returned). To be fair, it's self-described as only a demo at this point. I also wonder how, using the spatial layout metaphor, you browse multiple pages of results. Nonetheless, a very well executed demo. Kudos to the developers.