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The much hyped WolframAlpha search engine computational knowledge engine launched last night. This is from the makers of the truly mind blowing Mathmatica software, and is in some ways an extension of those ideas.
I haven't had time to play around with it much, but for sure it's worth a look. The UI is very nice, no doubt about it. But some of the hyperbolic claims of it's makers I'm guessing will turn out to not be true. Still, this looks like it might be a very useful tool.