Do you routinely print to multiple printers from your laptop? Now you don't have to manually switch printers when you go from, say, home to work. Windows 7 does it automatically.
The new feature, included in the Professional, Ultimate, and Enterprise editions of Windows 7 (sorry Home version users), works like this: Whenever you print, Windows 7 remembers which network and printer you're using. Next time you return to that spot, Windows automatically switches the default printer to match the one you last used. You can also manually pair printers and networks.
Setup walkthrough from Microsoft can get you started, and the tip HERE from the LT Unlimited blog provides an end user experience to review.