Google Calculator

Did you know that Google is a calculator? Just type a calculation into the search box and hit enter or press the search button. The calculator can solve math problems involving basic arithmetic, as well as fairly complicated math. My favorite is the ability to instantly convert units of measure (ie "150 miles in kilometers" , "1997 in roman numerals", "3 cups in tablespoons"). Complete instructions can be found here.
Ernster, the Virtual Library Cat