There's a new category ("ScrapBook") and one FAQ in it, #217. I added it (after briefly chatting with Denise and Jesse) because I don't think the information about how a paid account's ScrapBook access degrades over time is available anywhere else.
So there it is. Feel free to improve on it. You don't have to ask me, either -- I just wanted to have the basic information there and have no attachment to the FAQ going forward.