OSXFAQ Mac OS X Design Tip-of-the-Day  

There's a little trick you can use that takes the layer you're on and converts it into a new layer that is a flattened version of all your layers. It doesn't actually flatten your layers; it gives you one single layer that looks the way your image would look if you flattened it at that point. To do this, start by creating a new blank layer, hold down the Option key (PC: Alt key), go under the Layers palette's drop-down menu, and choose Merge Visible. A new "merged contents" image will appear in the new layer you created in your palette. Why would you need this? I have no earthly idea, but hey, you might need it one day, and now you know. However, you'll never remember which page this tip was on, and it'll take you hours to go through every tip in this book to find it, so maybe you're better off just forgetting this tip now, while you're still sane.

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