Web Address: http://www.wolframalpha.com/
Have you ever wanted to know the GDP of Liechtenstein? What about the average weight of a Bottlenose dolphin? You can always 'google' it but now you can WolframAlpha it too. This website was developed by a Wolfram Research, a company that produces Math software. WolframAlpha is different than other search engines because it is driven by data and results are data instead of web pages. You can type int mathematical equations and get the results or ask it questions like the average weight of 40 yr olds in Italy.
Check this link for a video describing how it can be used then WolframAlpha to your heart's content!