What does the "n" button on the nookColor do?

This NOOK symbol on the lower front of your NOOKcolor (the metalic "n" button) is called the "Home" button. When you press the Home button while the NOOKcolor is sleeping it will wak up the NOOKcolor. If the NOOKcolor is already on, pressing the home button will take you back to the home screen (the one with all your books).