I have no idea how this happened.
I am reading Chapter 5 of Asking Better Questions. The authors propose three broad categories of questions. The book, which totally qualifies as a classic teacher resource, also suggests that instead of asking "What type of question should I ask?" it is probably more practical to ask, "What do I want this question to do?" Download and read Chapter 5 here (PDF).
Also: The Mamas and the Papas - Monday, Monday