Using Layer Comps in Photoshop CS3
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If you use photoshop to create any designs for interfaces, web or print you probably are either using groups to separate pages or separate photoshop documents, or possible Smart Layers. Using groups or smart layers that are intelligently named is a very good way to separate out different instances or pages within a single design without having multiple files. Taking this a step further, as of the Adobe Creative Suite, Photoshop has introduced Layer Comps.
Haven't heard of it?
-- Not surprised, it's sort of hidden and took me a while of digging through this program and upgrading to CS3 before I really started using this feature.
Using Layer Comps
Layer comps 'remembers' the location of your hidden/visible layers, as well as position and layer style if required. In the layer comps panel (Window -> Layer Comps) you can create a new layer comp, or switch through comps similar to how you hide/view layers in the layers panel.