I recently bought the Art of Iron Man 2 book, and I have to say, if there's an Iron Man fan buried somewhere within you, you have GOT TO GET THIS BOOK.
So much detail and extra concept photos, extra stuff about the concept designers and some stuff from Jon Favreau...
You gotta get this book. It's half an inch thick, just LOADED with extras.
I bought mine used, but it was Damn Near Brand New.
Awesome Book.