Well, I found recent book about concurrency at last :) This time it is not free (are you surprised? I'm not) and available either as print book (search Amazon or any other your favorite book store) or official e-book (see Diesel eBook store).

Comments on it are good all over the Internet making me to be really interested about it. What's really interesting - it has been ~30 month of hard work for its author Joe Duffy to write. And he did it from inside of Microsoft: "Joe is the lead developer and architect for Parallel Extensions to .NET, tinkers with type systems, and is an author and speaker." -- personal info from Joe's blog.

Hope this book is indeed that good as everybody's screaming :)