WolframAlpha is pretty cool. It comes up with some interesting information. Type in "meaning of life" and see what happens.
The Wonder Wheel is from Google is a type of visual search. I don't have a direct link to it, but here is a link to my "instructional technology" search. It lends itself well to exploration.
Lastly, Spezify is the one that is especially well suited for exploration. I did a search for "instructional technology" on that one, too (you might have to reload it if there are a bunch black boxes). The text field where you type in your search terms is just to the right of their logo on the header. I like how you can explore the visual results, but also there are search terms on the black bar just under the header/text field that you can click on and go to different results.



Cool, I have been playing around with wolframlpha for the past week. The Wonder Wheel is similar to Grokker's idea. Check it out.. www.grokker.com and select the "Map View"
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