Then, it turns out that WolframAlpha is a computational engine which targets at delivering the numbers in a meaningful format.
I searched for "distance from New York to New Jersey" on WolframAlpha and it gave me the exact distance in miles (52.61 miles) and it also gave me results in meters, kilometers, nautical miles (??) and centimeters (??????). On top of it, it gave me direct travel time taken by flight, sound, light in a fibre and light in vacuum. Now most of the data that it returned are something that I do not care about. When I search the same on Google, I get links to distance calculators.
After going through the examples, I could gather that, WolframAlpha in its current form is a great resource for research analysts who play with data. It is not that Google cannot provide this data, but WolframAlpha makes this data understandable and much more accessible
Search for "India literacy" on Google and you will get 61% as the first result (without even digging the link) and this was present before WolframAlpha could do it with it computation engine based on Mathematica.
Is WolframAlpha a semantic search? I don't agree entirely. The structured queries as per their examples are fine, but here is why I am saying it is not entirely semantic.
I did see some weird responses as well. I searched for "voting age US" and it did not give me any result, whereas "voting US" gave me the result as "18 years of age; universal".
I searched for "US viting" and WolframAlpha interpreted it as "US Vitina" and showed me the distance from the US to Vitina in Bosnia and Herzegovina. Google prompted me and asked "Did you mean: US voting".
WolframAlpha has taken online computing to a different level, but not yet usable by common internet user who is used to Google. They are working on a lot of stuff right now and may soon come up with something far more robust, but will it challenge Google at any point? No I don't think so, just because the purpose of WolframAlpha is completely different from what Google is designed for.
Again, Google Squared is in the news now and is being termed as "WolframAlpha killer'.
Note to Wolfram: ... I am not looking for distance from New York to New Jersey IN CENTIMETERS OR NAUTICAL MILES, and I am definitely not interested in how soon light will reach NJ from NY in vacuum.