This book is targeted to several developers:
The text includes enough back story to explain the Web development saga even if you've developed only desktop applications.
The text explains how ASP.NET 2.0 is different from ASP.NET 1.x. The text also includes references explaining differences between ASP.NET and classic ASP.
Most chapters stand independently. You don't have to read the chapters in any particular order to find the book valuable. Each chapter stands more or less on its own (with the exception of the first chapter detailing the fundamentals of Web applications—you may want to read it first if you've never ventured beyond desktop application development). You may find it useful to study the chapters about server-side controls together (Chapters 3, 4, and 5), but it's not completely necessary to do so.