If you already have the book "Introducing Longhorn for Developers" (given away free at the PDC), DON'T BUY THIS BOOK. It's the EXACT same book with a different title. In addition, the first three chapters are available free online at:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnintlong/html/longhornintro.asp

Скачать книгу бесплатно (chm, 1.32 Mb)