http://www.opengl.org/sdk/tools/ShaderDesigner/
I found this and it sounded really good; a tool for debugging GLSL that isn't bloated to hell and back like RenderMonkey or the nVidia tools. Only one problem.
On three different test systems, it flat out doesn't work. I can't find an older version anywhere or anything and the email links on the homepage are dead. Installing .net and rebooting had no effect. Does anyone have a version that actually starts up or a fix?
Athlon64 2.7gHz->OC 3.9gHz, 31C, MSi 9500GT->OC 1gHz core/2gHz memory, 48C, 4Gb DDR2 667, 500Gb Seagate + 80Gb Maxtor + 40Gb Maxtor = 620Gb, XP Home
Air cooled, total cost £160