I saw a wonderful doco on JW a few months ago. It really gave alot of insight and information, especially on the door to door thing.
If they repeat the doco (think it was SBS), I'll let you know, its worth watching.
This doco is called 'Knocking' and you can buy it from ABC shops. I found it fascinating as well - despite being fairly well known, there's a LOT of weird stories about JW's, so it was refreshing to have the story told correctly. I think people also appreciated both sides being shown, with the grandmother who wasn't a JW telling her experience of when her daughter became a JW.