I just finished Secrets of Wilder and I am currently reading Samyama by Yogani.
Both are great. I like the former because it talks more about the AYPs from the view point of someone who is practicing them and experiencing the results. I picked up some very helpful practice insights from it. I like the latter because it makes more clear some things about manifesting positive changes in daily life.
Also, I am reading The Path of Fire and Light by Swami Rama. The subtitle says it all:
Advanced Practices of Yoga. Lots of good info on subtle breathing.
One other: Raja Yoga by Selvarajan Yesudian and Elisabeth Haich. A great book, formerly entitled Yoga, Uniting East and West which explains Raja Yoga (steps 5-8 in particular) from both an eastern and western point of view. In fact, it teaches Yoga from a new testament perspective and Christianity from a yogic perspective. Pretty neat.