The new kid on the block in the world of search wolframalpha went live today and on initial looks it seems quite impressive, I don’t think it is a challenger to Google as it seems to be quite a different animal but the data that it provides is pretty impressive! “
To use a term that quite a lot of people are quoting it’s more of an “Answer Engine” as it provides you with direct answers, rather than point you at pages that in turn may hold those answers.
I’d recommend checking out the hundreds of pre-populated “examples” to see how certain types of queries are best structured. Many of these examples feature structured input fields (for example, weights, measures, dates, and so on) so you can express your question more specifically than with natural language.