While not specifically about ASP.NET based web services this book
talks about Web Services using Google and Amazon an example of
public Web Service providers.
Since we showed you the usage of Google and Amazon in class and
provided the code to access these important web services you will
find this book has a familiar ring to you.
There is no .NET in this book at all, but that's OK since Web
Services are all about standards and interoperability.
In course 508 you learned about .NET Web Services this book will
give you a wider perspective on the subject of Web Services.
Excellent book to build your Web Service