Man, go, get that book now. Its the fantasy novel of fantasy novels imho. It is incredibly imaginative and no cheasy tolkien fare at all. The themes it incorporates into the story are quite serious and relevant too. And all this in a nice and entertaining package.
That said, this material is hardly transferable to a movie. I think the first movie did a good enough job picking one theme, the nothing, and get a coherent watchable movie. I mean there is so much cool shit in the book.
I just thought about how I would illustrate Graograman (the lion in the desert of colors, dont know, if thats his name in the English version)the other day. Its such an awesome, awesome character.