Today's OReilly Deal of the Day at http://oreilly.com/ is CLR via C# price $23.99
I am currently reading CLR via C# ISBN 978-0-7356-2704-8. Whilst quite correctly described by the publisher as a "Deep Dive", this is a book that C# developers with 6-18 months plus experiance ought to read. Certainly any serious Microsoft programming shop ought to have a copy. Even our experianced VB.NET bretheren will benefit from reading this book.
When I started programming 31 years ago I went through IBM 360 Orientation - this gave me an comprehension of what worked best at the machine code level - this is the first book I have found that explains the the working of the Dot Net framework to explain why particular choices are good,
I will be blogging more about this book.