NO LYE! is probably my favorite book on the topic of natural haircare for Black women. Although I've owned it for several years, I still find myself pulling it off the bookshelf when I'm contemplating a new style.
Tulani takes a decidedly "Afrocentric" approach to hair styling so you won't find any braid styles that "mimic" European hair (for example, there are no weaves or individual braids w/ human hair ends left free flowing).
NO LYE! is full of useful information about the various "types" of African hair and how to best care for it in it's natural state. It also contains information on hair adornment, proper diet, caring for children's hair, alopecia and dryness/breakage.
The book is full of beautiful black and white pictures of sisters (with and without extensions) sporting braids, naturals and locked styles. Since I'm considering locking my own hair, I found the info in the lock chapter to be inspiring and extremely helpful.
NO LYE is a fantastic all-around reference book for natural hair but many of the styles would probably have to be done by a professional stylist if you aren't an expert braider yourself (I'm not). There is a brief segment on how to braid with extensions but it wasn't detailed enough for me to copy. Aside from twists and short naturals, there aren't many do-it-yourself styles for natural sisters in the book.
In any case, I would recommend this book to anyone that has recently made the committment to natural hair.