Asp.net 2.0 Mvp Hacks and Tips by Dan Wahlin, David Yack, Fredrik Normen, J. Ambrose Little, Joe Mayo, Jonathan D. Goodyear, Scott Hanselman (2006, Paperback)

This book is an absolute must-have for any serious Internet programmer today.
Besides being an informative read (wow! Someone can do that?), the information learned is insightful and informative.
Even if you never use any of the tricks they show you, just knowing how something is done prevents you from creating a “hole” – since you know how to plan around it. Besides, even the most careful programmer needs to be aware of the darkest intents, for in the Internet environment, ignorance can not only be embarrassing, it can be very costly.
Also has a great section on converting Net 1.0 to 2.0.