The calculator has always been a useful little app, but it's been super-sized in Windows 7. At first glance, it looks like the same old calculator, but if you click on the "View" option in the toolbar, you'll see they've added several new features, to include:

    * A unit conversion calculator that lets you convert things like angles, area, energy, temperature, pressure, and a bunch more
    * A date calculator that can determine the span between two days (in days, weeks, months and years, or simply in days)
    * A series of worksheets that can be used to calculate Mortgage Rates, Vehicle Lease Rates, and Fuel economy in moth MPG and L/100 KM.