TIP: Advanced tip for Layers freaks

This is one of the those tips that will really strike a chord with some advanced users, and at the same time be completely and utterly useless to others. It's actually a hidden CS2 shortcut for inverting a Layer Mask as you duplicate it. First hold the Shift key, then click and drag the Layer Mask thumbnail to the layer you want it to appear on. If you want to invert and duplicate the mask (rather than move it), hold the Option key (PC: Alt-key) as well. See, a perfect tip for the Layer freak deep inside us all.