It kind of sucks that Windows 7 stripped the built-in Photo Gallery and movie-making software that Vista and came with even the Windows Calendar is gone, but a few of their built-in stand-bys did get some attention. WordPad and Paint both got the Office 2007 ribbon installed, and Calculator now incorporates real world uses into it. Only masochists still use Paint and WordPad, but having bestowed the ribbon to those inconsequential programs may be a taste for more upgrades to come. 
It used to be you'd have to download a special package to get a scientific calculator. Now the View menu offers a wide choice of functions.
Choose form any number of nerd calculators.
and even some useful worksheets (from the same menu) like a mortgage, vehicle lease, and MPG calculator.
