When processing, it's always a good idea to ask the "What is it?" question. Some possibilities are projects, next action, project support, calendar, and well, you know the GTD litany. But there are specialized collections, like motivational aphorisms. Some people put such items in a special database, others put them randomly in a tickler file; what you do is up to you. That brings me to the organizing phase, where it's always good to ask "Where and when do I want to see this again?" Maybe the answer is "When I'm working on project X," or "When I'm feeling like I need a boost." It should be your answer, though. It doesn't have to be the same answer always: projects finish, systems evolve. But it always should be your answer.