This NPR article about journalism veteran John Sawatsky discusses the best way to interview people:
Sawatsky's rules are simple, but he says they get broken all the time: Don't ask yes-or-no questions, keep questions short and avoid charged words, which can distract people.
Linked to the article is a great NPR recording of an interview of a man who was attacked by a beaver! With one question "What happened?", the interviewer gets the whole story.

