SearchEngineLand has an article about a new search engine called "Swingly" that answers your questions directly rather than giving you a list of sites where you might find the answer.
Swingly does well at certain kinds of questions like "What was the first video on MTV?" However, Swingly could not answer the logical inverse of that question. When asked, "Why are the Buggles important in music history?" Swingly's answer was less than satisfactory. However, this "why" question is more subjective than the question that preceded it.