Mac OS X Leopard has hundreds of features. Some of these go by unnoticed, even when mentioned in the full list on Apple.com. One of these features is the Spotlight calculator. If you a type simple problem into Spotlight the first result will be the answer. Same thing goes with words. If you type a word into Spotlight the first result is the definition, then you can click the definition to open it in Dictionary.app.
This is very useful to solve a problem quickly, and you don’t have to open any applications!
