More guns, less crime is interesting...but gets quite statistical/analytical/academic after the beginning.
If you want to just read quick statistics than I would suggest you download and print out the (Link)gunfacts book. It is very interesting and you can put it down and pick it right back up anytime.
I just read the book "The Gift of Fear" by Gavin DeBecker. It isn't about guns or CCW, per se, but it is very interesting about your mindset and internal self defense and protection mechanisms. It has many very interesting stories illustrating how situations can escalate quickly, and how to prevent them. I highly recommend it.
I've read the books by Wayne LaPierre (president of the NRA), they are good also...quite similar to one another, but still good.
Guns, crime, and freedom (1995)
Shooting straight : telling the truth about guns in America (2002)
Guns, freedom and terrorism (2003)
Personally I'm trying to get my hands on the following:
Rage of the Random Actor: Disarming Catastrophic Acts And Restoring Lives - Dan Korem
Armed and Female: Twelve Million American Women Own Guns, Should You?
Dial 911 and die (might be interesting).
In the Gravest Extreme, by Massad Ayoob