View this book as a quick intro to WinFX and you should enjoy it. This is one of the smallest .NET books I have read (257 pages). The book primarily covers Windows Presentation Foundation (WPF, formerly Avalon) and Windows Communication Foundation (WCF, formerly Indigo). It also includes a surprisingly good chapter on Data Binding as well as some seemingly random topics like ASP.NET and Windows Services. It does not cover any developments after Beta 1. It does not cover WinFS or Aero.

The quality of the writing is quite variable (probably because of the many authors and lax editorial work). The chapter on Data Binding is excellent. The WPF section is fairly readable, though parts like the coverage of the Dependency Property system are not very clear. The section on the WCF is the worst. This section suffers from unclear writing, typos, bad formatting, and buggy code. The author(s) of this section also have a poor grasp of basic .NET concepts like iteration.

The book is aimed at experienced .NET developers. The authors expect that you know about C#, the Common Language Runtime, XML, and the .NET Base Class Library.

The price of the book seems high for the length--particularly when you factor in the quality.

Despite the mediocre quality of the book, it is one of the few overview references on WinFX currently available. Until books based on the final version of WinFX become available, this book is a reasonable choice. I recommend this book to those who are unfamiliar with WinFX and would like a quick intro. If you want significant depth or high quality, look elsewhere. If you have read a few articles on WinFX already, you may want to go straight to a more in-depth book.