Two items:
HomeGroup Overview
This white paper provides an overview of HomeGroup, a new feature in Windows 7. HomeGroup takes the headache out of sharing files and printers on a home network. It is a collection of two or more computers in the home that are automatically set up for easy sharing of music, pictures, video, and document libraries, as well as any connected printers with others in your home. It also allows you to stream media to devices. An explanation of general scenarios and basic technical data is included.
Windows 7 & HomeGroup: Sharing with Windows XP, Windows Vista, and other operating systems
The purpose of this white paper is to explain how your computers that are running previous versions of Windows can access the files and printers shared with your homegroup on your computer(s) running Windows 7.