Lubos Motl, The Reference Frame, Summer School of Philosophy, here.
Walter Hickey, BI, 32 Tricks You Can Do With Wolfram Alpha, The Most Useful Site In The History Of The Internet, here.
Wolfram Alpha is probably the most useful site on the internet.
It’s not a search engine, it’s not an encyclopedia, and it’s not a calculator, but it’s a little bit of all of that. It’s really the only member of its field.