I was fooling around with a link to Wolfram|Alpha that actually works, and after several test entries it spit out this error message:
I'm prepared to declare that this will be a huge hit based on the coolness factor of that error message. From Wikipedia: Wolfram Research
Wolfram Alpha is not a search engine, as it does not look up answers to queries on an index of web pages or documents. Queries and computations are similarly posed to it via a text field, but it computes answers and relevant visualizations on the fly from a knowledge base of curated, structured data. Alpha thus differs from semantic search engines, which index a large number of answers and then try to match the question to one.
In 2009 it's hard to beat humans.