The February edition of the free Microsoft book of the month includes a downloadable version of the Windows Vista Resource Kit, which you might find interesting if you're looking for details about the new features in Windows Vista. There's no reason to get this book if you're just interested in managed code development and not into system configuration or how the underlying native components work. However, if you want to learn more about using or configuring the networking features added to the operating system, start looking around page 1100 and continue on for the next few hundred pages. Since this is a limited time offer for the next day or two, go ahead and grab the book if you think you might be interested.