specular maps

hey could some one point me to a good tutorial on make specular maps?
please and thank you

i really need this for my next project

http://cg.tutsplus.com/tutorials/3d-art/next-gen-weapon-creation-day-4-diffuse-and-specular-textures/

http://www.game-artist.net/forums/spotlight-articles/42-tutorial-hard-surface-texture-painting.html

http://amc.ro/go to amc shares, tehre are some kick ass tutorials for spec. NM etc enviornment based

that last link doesn’t work

http://www.amc.ro/