This is amazing. Check out a "sneak preview" of Stephen Wolfram's Computational Knowledge Engine. Watch the video, then start experimenting with your own searches. This is only the beginning, an "alpha" version. It is about to "go live".
It is designed to "compute answers to your specific questions." See also a much longer talk by Stephen Wolfram at the Berkman Center for Internet & Society at Harvard University. The last question (1:40 minutes) asks how libraries will use or not use Wolfram/alpha.