I've been working my way through "ASP.NET 3.5 Unleashed" lately. Although I'm not quite finished, since the book comes in just under 2000 pages, I do feel confident in writing a review.
The Unleashed series has a certain following behind it for being a fairly comprehensive guide to the technology the book examines. This entry into the series is no exception. This book goes into every detail of ASP.NET and ready digs into the new features of 3.5, as you may expect given the title.
I've enjoyed the way this book presents material. It's not too detailed for the beginner but doesn't leave the experienced wanting too much more. I would highly recommend this book to anyone looking for information on ASP.NET 3.5. This book is something every ASP.NET book should aspire to be.