Guus started a new section in the OpenGL wikibook about scientific uses! In a first tutorial, he showcases how to interactively plot a simple mathematic function:

http://en.wikibooks.org/wiki/OpenGL_Programming#The_scientific_arc

The lighting front is also progressing with a new tutorial on ambient and specular lights:

http://en.wikibooks.org/wiki/GLSL_Programming/GLUT/Specular_Highlights

Enjoy!