Today I spent a long time just working on the Phong model stuff that wasn't exactly correct in my ray tracer. I believe I have generally fixed my problems, but touching base with Nate Gaunt might be a good idea.
Coming soon : Dielectrics!
One of the "interesting" images I generated while getting this working...
1024 x 1024 @ 128 samples / pixel (both with a specular power of 25)