Wolfram Alpha

Wolfram Alpha is the new "computational knowledge engine" that everybody's talking about (well, all the nerds are). If you don't know what this is or haven't seen a demo, check out this video: http://www.wolframalpha.com/screencast/introducingwolframalpha.html. It's kinda long, but you'll probably get the idea after a couple of minutes.

I don't think this is gonna put Google out of business or anything, but it does look pretty awesome.