Just a question, is it possible to write a renderer with just GLSL and not using fixed pipe programming.

My renderer uses strictly GLSL. I tried to disable the GPU program to draw some unlit lines with Fixed Function PL but couldn't get it to work so I just used my "FlatShader" to draw them.

GLSL makes it way to easy to add new features, I suggest you go for it.

edit: When getting started I asked what shaders I should start with. Here are the shaders I use to give you an idea.

Ready for GLSL
Program Log: c:\media\shaders\shadow.shader <-depth only
Program Log: c:\media\shaders\flat.shader <-no lighting
Program Log: c:\media\shaders\brightfilter.shader <-bright pass filter
Program Log: c:\media\shaders\finalmix.shader <-final scene mixer
Program Log: c:\media\shaders\horizontalblur.shader <-blur filter
Program Log: c:\media\shaders\verticalblur.shader <-blur filter
Program Log: c:\media\shaders\pervertex.shader <-simple lighting
Program Log: c:\media\shaders\simple.shader <-not so simple lighting/shadowing
Program Log: c:\media\shaders\sky.shader <-sky renderer

All but the last 3 are loaded by the renderer for scene independent use. The last 3 are loaded as needed by loading models into the renderer.