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If the book you are referring to is "Programming ASP.NET AJAX" there is a zip file with examples here:
Hope this helps, if you're looking for something else, please let us know and we'll do our best to get you what you need.
EMPLOYEE0Another way to access the code for this book is through its catalog page - on the left hand side, underneath the picture of the cover, there are a few links - the top one will say "Examples" in a little bit darker blue than the rest. Just click on the link and you will be directed to any extra material for the book.
This will be the same for almost all O'Reilly titles that have source code or examples which accompany the book.