Some of what is included on the site below is quite technical, but there is some good content on there. For example:
http://www.matterofstats.com/mafl-s...urprising-things-ive-learned-about-afl-so-far
http://www.matterofstats.com/mafl-s...urprising-things-ive-learned-about-afl-so-far