This is a great trick we learned from our buddy Mike Ninness, and the first time we saw it, we said, “Hey, wait a minute, that can’t be.” Oh, but it be. It’s how to undo a Save. This is especially helpful after you’ve flattened an image, saved the file, then realized that you needed to change something on a layer. This only happens to us about every other day, and here’s the keyboard shortcut to fix it: Command-Option-Z (PC: Control-Alt-Z). Press it a few times after you’ve flattened and saved, and look in your Layers palette to see all the layers come a-rumbling right back. Pretty slick stuff.