By way of Brad Abrams' Blog:
I am very happy to have this book done! Ever sense I started working on the CLR, almost 6 years ago, I have wanted SOMEONE to do a book like this. In a past life when I did Java development, I really liked Chan (et al)’s The Java Class Libraries, Volume 1 and I wanted a similar book covering the BCL. At the time I didn’t think I would be the editor. This book could have never come together without significant help from a large number of folks. I will not repeat the book’s acknowledgements here, but know that it is more their work than mine.
So, consider this the first plug for the .NET Framework Standard Library Annotated Reference Vol 1 (I think this needs a shorter name, how about SLAR)?
I have been watching for this book for awhile; waiting for it to be available so that I can dig in. In fact, I was looking to buy this one earlier today and noticed it's finally available on Amazon. If you enjoyed The Common Language Infrastructure Annotated Standard as much as I did, you will definitely want to get hold of Brad's book as well.