Where can I find good fragment program tutorial

Hi guys!
Needa subj with good samples.
Thanx in advance

I don’t have any tutorials, but I do have several demos with source using it.
http://esprit.campus.luth.se/~humus/

The links on this page includes :
“ARB Fragment Program: Fragment level programmability in OpenGL - Evan Hart, ATI”
http://www.opengl.org/developers/code/tutorials.html