There is a great episode of Gruen Planet discussing the movie The Master, which is about Scientology.
http://www.abc.net.au/tv/gruenplanet/pages/s3607843.htm
Gruen Planet generally examines current advertisements, but this episode is mostly about Scientology. It ends up very much about Religion in general, and shows how the principles of marketing and the growth of religion correspond exactly.
There was an interesting comment on how cults grow through one-on-one contact (which was reminiscent of JWs), and then how that is becoming ineffective and out of date.