I just learned that google has implemented a calculator as part of their feature set. "Big deal," you might say, but one capability that I found very useful is its ability to convert units. Try entering "100 pints in gallons" (don't put quotes around it when entering it), or "5000 kilometers in furlongs". Very cool, at least to me. I can't tell you how often I have to do those pesky "angstroms <--> parsecs" conversions (ok, I jest, but it will do "100 degrees fahrenheit to celsius," which definitely IS useful). It can also do ordinary math, of course, for...