I have Furey's book and most of Pavel's, and have learned a lot from all.
"Combat Conditioning" is a lot like SCUBA Team PT was when I was on a team, with some wrestling conditioning drills thrown in. It's basically high-rep calisthenics designed for endurance. The bridging exercises have been especially helpful for my back and neck pain. Just be careful when you first start doing them. Some believe them to be potentially harmful, but I haven't had any problems.
Pavel's "Naked Warrior" has an entirely different focus. It's primarily about building strength with bodyweight exercises and focuses exclusively on two; one arm pushups and one leg squats. Most of us have done one arm pushups at some point but have you ever tried it with one arm and one leg? It's interesting, so say the least. There's a strong balance component involved. I haven't managed one yet, but I'm working on it.
I have Pavel's "Power to the People" which is about pure strength building using two exercises; the deadlift and the side press. The principles and techniques taught can be used for any lifts but these are the one's the author likes for this routine.
I also have his "Russian Kettlebell Challenge" which is about strength and endurance using kettlebells. Can't speak to the effectiveness of K-bells since I've never even touched one, but the exercises work just as good with dumbbells. I've made a lot of progress with some of the exercises in this book.
I haven't seen it but I've heard very good reviews on a book put out by Ross Enaimit. He's a boxing coach. You can get more info from
www.rossboxing.com.