I've been using Photoshop for seven years. And I just discovered this little trick by accident today. It excited me so I thought I'd do a quick tip about it.
You find that when you digital scrap you end up with A LOT of files open on your computer. They can be a pain to manage. I know, I know, I should just close them when I'm done as I go. But I don't. So I always have tons of stuff open.