As I mentioned earlier I always wanted to read C# via CLR by Jeffrey Richter. Finally I got it a few months ago and while I was sick I read it. I think it's just brilliant because:
- I like the way Jeffery explains problems.He is strict and precise whenever it's needed but no more.
- As far as I know he is not a Microsoft employee which lets him express criticism of everything that deserves it.
- It reveals lots of things that you will never be aware of unless you start thinking in an illogical way. Unfortunately CLR and/or C# not always behave in a predictable way.
- The books touches nearly all the .NET internals that you can come across during your everyday job as long as you don't work on compilers and runtimes :).