The premise of this book is that as a society, we have become too over-protective over our children and not allowing them to do normal things kids can do.
I would recommend reading this book to all parents. It is one of those books that causes a lot of self-reflection and reevaluation of yourself and how you parent. It really made me think about the rules we have and what we might want to change.
I do not agree with everything in the book. It is a light read and easy to get through, but she tends to be pretty critical (or mocking) of parents who choose to do things differently than she sees as the "common sense" way of approaching things, and I do not like that. I think her points could be made without that aspect. The earlier chapters are thicker with that feeling against other parents, then she backs off as the book progresses, so trudge through that aspect (if it bothers you).
Like I said, it is a book that gets you thinking and is absolutely worth your time to read. I think a book that causes parents to be introspective and more deliberate in their choices is always worth the time it takes to read it. That is what makes us better parents, even if we don't agree with everything we read to get there.
If you would like a feel of Skenazy before you read the book, you can see her website here: http://freerangekids.wordpress.com/.