Wolf Ram Alpha is a computational search engine geared toward science and technology stuff. For example, I looked up, "sin^2(x)+cos^2(x)" which is a Trigonometry Identity (actually it’s sin^2(x)+cos^2(x) = 1), and it returned me with a nice graph, alternate representations and so on.
At the bottom of the result, they also have the feature to save the results as a .pdf file. Really cool feature that other search engines lack.
Then I looked up Calculus, just to check if it gives any kind of result like the traditional search engines. However, it actually suggested different topics directly related to calculus.
To dig a little further, I looked up "fuel usage 800 miles, 27 mpg" and the results really surprised me. Even Wikipedia doesn’t give you information like below:
Overall, I don’t think it’s actually a threat to any of the traditional search engines, but another cool resource to aid you in your research.
Example Queries: http://www22.wolframalpha.com/examples/