For years now, when you wanted to put a selection around everything on a particular layer, you would Command-click (PC: Control-click) on that layer in the Layers palette, and it pretty much didn’t matter where you clicked, as long as you clicked. Well, in CS2, it matters. You now have to click directly on the layer’s thumbnail to get the selection to load. So what happens if you Command-click (PC: Control-click) on the other part of a layer (the layer’s name for example)? It highlights that layer, so you can select multiple layers at a time.