of WolframAlpha if only because I can plunk in all sorts of questions to see what its limits are. Some disappointment thus far: I asked what the distance from Earth to Saturn would be on a certain date and it could not calculate my answer. Nor "how many sonnets did Shakespeare write?" Nor "Year of Shakespeare's death minus 2009."
On the other hand, just guess what it spit out when asked what the answer to life, the universe, and everything was.
Check out this piece in the Times too. WolframAlpha is not mentioned but provides the same kind of mathematical information mentioned.
Inscribed by DEFCON1 at 9:58 PM