I think this thread has been helpful, coming from a new diver standpoint.
I think, also, that a lot of new divers don't take their C-Card for what it is. When we were given ours, we were told it was a license to lean more. And, that's what we're trying to do. I think many new divers think, "Ok, I've got my card, I can go dive and do whatever I want, and I know everything."
Our instructor really drilled it into us, that this was just our 'ticket' to allow us to lean more about diving, the underwater environment, etc. Not a free pass to go out and be a moron, or think we're super-divers because 'I'm CERTIFIED!'.
I, personally, think that that is an imporant lesson that not enough instructors give their students.
ETA: I intend to use SB to assist in furthering my learning, along with books, and future training, and diving. I think those are key.