[quote="Raven67854"#Sakar]I have used XNA in the past. Its a very nifty game library for C#. Personally I think most of C#'s success is due to the introduction of XNA.[/quote]
C# was in wide-spread use years before XNA was released. C# is merely popular because Java skills are portable to it, and it leverages the .NET platform for creating web applications. As far as web applications go, .NET is the most complete platform ever made. It is just a little jumbled and can be hard for new users to wrap their head around the class library (which is the largest ever packed in with a general-purpose language). I like C#, but it is also nice that if you learn Java, you basically know the syntax and usage in C#. 
And yes, there is a book coming out, but it has been pushed back. It now lists it as May 18, 2010, so you definitely have a while to work with XNA before it comes out. Here is the Amazon link 
here.