I tend to wolfram it when googling it fails. E.g. when considering buying a new place in Tokyo:

http://www.wolframalpha.com/input/?i=historical+interest+rat...

Compare those awesome results to the crap google offers:

http://www.google.com/search?safari&rls=en&q=histori...

Google is more generally useful, and has changed all of our lives for the better. Nevertheless, Wolfram Alpha is far more useful in certain contexts, in my experience, and not necessarily just for mathy stuff.