I have tried to implement Matt's shader (in wiki) on a crate, but it has no effect. I did this through an effect file in a material assigned to the crate through an action, but it does not work. I am confused - how does the shader find the normal map skin. Can anyone help me here?

Make sure you're using dynamic lights

Ah, that fixes it, althought I can only just about see the normal mapping. How do I increase the specularity?

Specularity is controlled by the alpha value of the normal map. For dirt, I'd say a good alpha should be ~15%

This doesn't seem to work. I decreased the normal map alpha with GIMP. I then decreased it in med with material settings (the 2nd material, called entSkin2). I then tried to decrease alpha of the normal material. None of them helped, so how exactly do you do it?

Hmm... I'm not so sure about Matts shader. I use my own (in my sig)...

its the same, i use matts