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Normal Maps question

Are there different kinds of normal mapping? I want an article that focuses on Normal maps and says everything about them.
Well I found this. But I'd appreciate it if you know an article that's dedicated to normal maps.
Thanks

p.s: wow, Chronicles of Riddick's graphics look amazing! It's got a pretty high score at GameSpot (9.3)
 
Without normal mapping, the Normal is usually specificed at each vertex, with the normals for the insides of the triangle interpolated between those 3. With normal mapping, you get to specify whatever normals you want for the interior of the triangle. Therefore, you can have arbitrary bump mapping effects.
 
It's the new thing now. You can get away with fitting in a lot of textures, lighting, specular hilighting, etc. with less proccesor costs. It seems to be replacing bump mapping.
 
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