I was an avid fan of the previous edition of this book which covered ASP.NET 1.1 and, as a result, my expectations of this book were rather high. I wasn't let down. Stephen Walther has taken a considerable amount of time to go through ASP.NET 2.0 with a fine tooth comb and write a book which is not just an essential aid for learning ASP.NET 2.0, but also a fantastic reference book for the seasoned developer.
He covers new areas not seen in previous books, such as the new themes and memberships and roles features which are now in ASP.NET 2.0. He also used Visual Web Developer Express as a tool to develop the examples. The developer who likes to keep up to date will not be dissapointed either, as he covers how to develop AJAX with ASP.NET 2.0. Note, however, The ATLAS framework (ASP.NET 2.0's AJAX framework) is not covered.
All in all this is an essential purchase for ASP.NET developers, new and old.