As posted by Brandon LeBlanc at the Windows Team Blog:

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As many of you have noticed, there is a lot of information out there about Windows 7 now that it is available for everyone. You can find information on everything from the Action Center to Windows XP Mode on various blogs and web pages all over the Internet. You might want a concise guide of what Windows 7 has to offer and how it can help you and your business.  With this in mind we created the Windows 7 Product Guide.  This easy to read guide gives you a clear overview of the features in Windows 7 without a lot of technical jargon that you might find in other content. The guide was designed to educate and inform readers about benefits you get from adopting Windows 7.

The Windows 7 Product Guide is has three major sections:

• Introduction - Describes how Microsoft designed Windows 7, what editions of Windows 7 are available and what is new.
• Windows 7 for You - Goes over features in Windows 7 that, simplify everyday tasks, works the way you want, and makes new things possible.
• Windows 7 for IT Professionals - Explains how Windows 7 can make people productive anywhere, manage risk though enhanced security and control, and reduce costs by streamlining PC management.  This section also has an overview of the Microsoft Desktop Optimization Pack to help you learn about how this set of applications can help you get to a more managed and optimized desktop.

If you are looking for a good reference guide about Windows 7, I recommend that you download a copy of the Windows 7 Product Guide here (XPS and PDF versions available).