A sampling of books and sites that I have found useful and interesting.
med.stanford.edu – A very insightful statistics course
markmanson.net – Interesting insights on life, with a Stoic-like viewpoint.
howtobeastoic.wordpress.com – excellent blog of practical stoic advice
modernstoicism.com – another excellent stoic blog
www.rightattitudes.com – practical psychological advice based on Stoic principles