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Re:Wolfram Alpha tips for webmasters and sysadmins by pert on Tuesday May 26, 2009 @05:41AM (#626462)
AFAIK Google has done all of these things for some years. I regularly use it for the sorts of calculations mentioned in this article, such as:

http://www.google.com/search?q=2TB+%2F+1.25+MB%2Fs