I've finally finished the article I started for the Valve Developer Wiki on Phong shading and how it works.

The info within it comes direct from Jason Mitchell at Valve who had a hand in developing the shader itself and has confirmed all the info in it.

It's quite a long article but explains phong, how the shader works and all the parameters - including Fresnel ranges.

http://developer.valvesoftware.com/wiki/Phong_materials

Hope it finally answers some questions! :D

Dude, you rock!

Thanks for the time and effort, I know it was probably a lot ;)

Finally some "final" documentation!

Who's the man.....Trp. Jed!