Nice tip, Vash!
It should work nicely in CS2! I have CS3 and I'm just not sure if you are aware that CS3 will align images for stacking via the following procedure:
File, Scripts, Load Files to Stack...
It has an option to Attempt to Automatically Align Source Images as well.
Once the stack is built, of course, you then go through and set your blending modes.
To stack all your images at once, set the opacity of each layer to 1/n, where n is the number of the layer. That is, the background layer is layer is n=1 so 1/1=100% opacity, 1/2=50%,1/3=33%, 1/4=25%, etc.
Al.
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