Not sure about the 10 chosen, but that's half the fun of this sort of list.
I'm glad that the Stoics are included, but what about Stephen Covey's 7 Habits of Highly Effective People? Or some more modern CBT approaches as well as the admirable but a little dated David Burns?
I've been keeping a list of 10 ten personal development books I recommend in my life coaching practice for a number of years. For the latest see http://blog.timlebon.com/2012/... I've included Viktor Frankl's Man's Search for Meaning near the top my list, possible controversially. It wasn't written as a self-help manual but has definitely served that purpose.