Hi ! I just created a mailing to talk about GLSL shaders. Please join and discuss if you are interested. To subscribe, go to https://dataflow.ws/cgi-bin/mailman/listinfo/glslang-dataflow.ws You can accept the security certificate with no worries. :) This list will most probably last for quite a few years.
GLSL shaders are getting some attention on the pd-list since they work pretty well in Pure Data + Gem. People using real time video tools such as Python (pygame), Java+JOGL, C++ or Max/MSP+Jitter and such might be interested too.