I am not a big fan of Rachel Zoe, but I did like her book Style A to Zoe: The Art of Fashion, Beauty, & Everything Glamour very much. It has some great advice, does not focus too much on Rachel Zoe herself (even if some personal information and stories are included) and has a lot of very nice pictures.
Rachel Zoe does not live up to her bitchy and strange reputation in the book at all, but rather seems humble, passionate and knowledgeable.
Definitely recommended for those who want to make their lives slightly more glamorous!