I use PS CS & PSP 7

Hai, I was wondering if anyone knew of any tutorial that teachs you how to work with black & white pictures? I know how to desaturate a normal pic but I'm looking for a way to enhance their contrast and make them look "deep". Or just any tutorial that involves a black & white picture and NOT "how to make a picture to b&w" , please?

Also, I've been gone for a while so if you could post your latest favorite tutorial that would be great! Thanks to anyone that can help me :')