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Yea when I use normal maps I usually use the AO map to know where everything thing is on the model...it helps, like Tycho said, to paint dirt and stuff. Really with normal maps you want to refrain from using to much lighting because it is better if the lighting is realtime...so your shadows will move on the model.
So normally when I do normal mapped objects I have a shadow map on multiply set at a lower opacity or just dont have one at all. But there is really no set rule of having one or not...just experiment with it on and off and see what looks best.
Req good point if you do like G says and set the material to white and then set the background to white, it will help keep the edges cleaner....so that would be a better way to do it.
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