Ask HN: What site explains their complex value proposition/process best?

Many technology products and web businesses have complex propositions and features that are difficult to convey and often difficult to implement simply. And yet some complex processes are implemented in such a brilliantly simple manner that the user cannot fail. Here's one example to get things started: Tivo - You find the show you are interested in by title. Then to record every episode, they don't ask you to respond to "record at this time/channel for how many weeks?" (which would result in wrong recordings, repeats, etc.)...instead they say "season pass" which by default means every episode of your show and each of which will be captured by date with description.