Thanks to readers for these contributions on Moats.
An excellent case study on how Buffett learned to love float from the Fundoo Professor: Floats and Moats_Munger and Buffett Worth a study! And read more:http://fundooprofessor.wordpress.com/
An interesting blog: http://25iq.com/2012/12/06/charlie-munger-on-moats-first-of-the-four-essential-filters/
For easier reading: Blog on Moats
As you may realize, Buffett and Munger seek the stable or durable companies. Note where change is disruptive: http://www.businessinsider.com/mary-meeker-2012-internet-trends-year-end-update-2012-12#-48