In preparation to get you ready for the release of Windows 7, TechReviewSource.com thought it would be a good idea to take a look at perhaps the biggest change to Windows Explorer: Libraries. You'll run into Libraries each time you open a Windows Explorer window and they come pre-configured on each new installation of Windows 7, but what are they for and how do you use them? Their concept may seem a little confusing at first, but they are actually very handy if you know how to use them.