I have read all of them. The Baby Book is a good reference for the first 2 years for things like illnesses, milestones, etc. At our Half Price book stores and many consignment stores, you can find used, relatively new editions of all of his books. I prefer other pregnancy books. For an intro to pregnancy, I would recommend Pregnancy, Childbirth and the Newborn by Penny Simkin et al. I could also recommend several other books to you if you like; I am a midwifery student and have read most of them.
I am a 100% attached mama. I am still nursing my 2.5 year old as well as co-sleeping with her. My older dd nursed until she was 2 and weaned with gentle mama encouragement. She co-slept until she was almost 3. We had a huge bed-a king and twin pushed together-for awhile. It was heavenly not to have to get up for feedings in the middle of the night. I think that it is so much easier to respond to your children's needs without having to find your glasses, get up, turn the light on, stumble down the hall, etc. I also wear my babies until they don't want to any more. Neither one of my girls were in a stroller before the age of one. I still wear my 2.5 year old in a pouch when we go to Disney. It is huge debate, but I could and would never let my child cry it out. There are other ways to learn sleep and self-soothing. I believe in gentle discipline and don't spank or yell.
The results of my parenting are two spirited, sensitive, gentle, loving, engaging and independent girls. You wouldn't think that attachment would breed independence, but it does. The principle is this...you are always there for the child. When the child begins to separate, he goes and comes back to find you there. After the process is repeated, the child knows that you will be there and he can strike out on his own with nothing to worry about. I am not saying that non-attachment doesn't breed independence or other parenting methods will not yield independence, just explaining the theory behind attachment parenting.
There is another book to read on the subject of AP. It is called Attachment Parenting by Katie Ann Granjou. It is a short read and definitely worth the time.
As for Dr. Sears' medical advice, I pretty much leave it because I am very alternative when it comes to medicine. We have a chiropractor as our family doc and don't use allopathic medicines unless every natural attempt has faied.
Feel free to PM me if you have any questions! I love to talk AP.