Nothing in the book thats not on the websites
but not all airlines in the program have websites. The book comes out every quarter and is the size of the old printed airline skeds ( remember those?) so its quite handy when travelling.
Recently in Chicago while staying at the Hilton Towers I wanted somewhere to just get a drink and maybe a burger( not in the hotel) checked the book and found a place the next block over, got my miles.
Mike