I didn't read her first book (and probably won't), so if the 2nd book built on anything, I missed it. Basically, this books is a green primer. She covers all kinds of things - motherhood, natural beauty products, fitness, food, home improvement - explaining the basics of all of them. The main thing she does different is that she doesn't really embrace the hippie-aspects of the green lifestyle (though the idea that you can't be glamorous and frugal or green isn't exactly new). The voice she writes with is very fun, someone who doesn't want to be deprived of luxuries, and cares about how she looks.
The best chapters (for me) dealt with natural beauty products, cleaning and gardening. There are whole books on these topics, but this was a good way to get your feet wet. If you liked the idea, you could research that topic more. The sewing projects were really basic and honestly not that fashionable; her tips for moms include getting used clothes - definitely green and inexpensive, but you don't need to buy a book to get that kind of information. The food chapter was similarly disappointing - if you don't know how to make egg salad, you should probably be reading a cookbook. The worst chapter was fitness - the exercises she includes are all fine, but really, do you need a book to tell you that you can work out at home for free? And if you really did want to work out at home, aren't there tons of books and magazines written by fitness instructors that you could get from the library? What about borrowing DVDs?
So, overall, while some aspects of the book were OK, I wouldn't recommend this. It is well-organized, and the illustrations are great - since her first book was a NYTimes best-seller, apparently this information is new for some people. The only people I think that could benefit from reading this are people that really want to go green in some aspect of their lives but have no idea where to start; or people who think that being environmentally friendly means you have to forgo make-up, body products and fashion.