Umm Sayhun, Jordan
I'm absolutely blown away by yesterday's launch of Wolfram|Alpha.
Comparing it to Google Search isn't relevant, as Wolfram|Alpha is less about Web content and more about data mining authoritative resources.
Wolfram|Alpha's long-term goal is to make all systematic knowledge immediately computable and accessible to everyone. We aim to collect and curate all objective data; implement every known model, method, and algorithm; and make it possible to compute whatever can be computed about anything. Our goal is to build on the achievements of science and other systematizations of knowledge to provide a single source that can be relied on by everyone for definitive answers to factual queries.
Wolfram|Alpha aims to bring expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels. Our goal is to accept completely free-form input, and to serve as a knowledge engine that generates powerful results and presents them with maximum clarity.
The site clearly excels when it comes to math and science topics, but has a tremendous amount of archived knowledge to pull from on myriad topics. For example, in the screenshots below I asked Wolfram|Alpha to compare the most recent tourism data on Peru, Egypt and Thailand against each other, and to tell me about major earthquakes in Jordan over the past decade.
It would be just as easy to ask the site when the next total solar eclipse is going to occur in Cairo (in the event I one day wanted to take photos of the spectacle over the pyramids), or how long a passenger jet takes to fly from San Francisco to Tokyo.
I encourage you to just have quick peek at the examples page on Wolfram|Alpha to see some of the amazing data aggregation visuals the site is capable of.