Looking for an Intermediate C# XNA Gaming Tutorial / Book

Question

Hello,

I'm interested in making a really small physics based platformer game, I am trying to find a really good Intermediate XNA tutorial or book to teach me how to create a 2D game. (Even better if it's a platformer) There are tutorials online but I'm not sure which to use. I mainly want to focus on keeping my code clean so I don't get confused later on in my project. I already know the basics of C# so I'm not interested in a "teaching the c# language + how to make a game" combo. Last but not least, I'd like the book to explain the mechanics of the classes it uses and its usefulness in the game. Does anyone know of a book or online tutorial for this?