Srikumar's book Are You Ready to Succeed? Unconventional Strategies to Achieving Personal Mastery in Business and Life has been one of my favorites for a few years now and I frequently recommend it to friends and clients. It is definitely worth picking up and was actually one of the books that inspired me to become a coach!
It's a bit long for those of us who have ADD and are chronic multi-taskers (myself included), but you can plug in your headphones and listen to it in the background as you're checking email. Enjoy!