I picked up an excellent book on choosing a specialty. It's called "The Ultimate Guide to Choosing a Medical Specialty" It's in the Lange series and the main author is Brian Freeman,MD. It covers every specialty, and goes in depth about the residency, what the different fellowships are in each field, personality types and physical attributes fit well with what, why go into that field, etc. It also covers the history behind the specialization of medicine as we know it today. It also states the match rates of allopathic and osteopathic students in allopathic residencies, and what you should look to do to obtain certain spots from the first day of medical school. It even talks about how to go about matching if you're in a relationship with another med student. I highly recommend it because it is quite informative, and I haven't seen a more in depth book about choosing a specialty.