I think these types of questions should definitely be allowed here. When I created this site, I wanted it to have a really big scope... including just about anything about graphics cards. This would make it a great place for even non-tech people to find great answers to questions about GPUs. GPGPU programming is also pretty different to standard CPU programming and very similar to shader programming.
GPGPU actually is very graphics related. Raytracing, computational geometry, and visualization are just a few examples. FFT algorithms are used a lot in image processing.
Before Robert Cartaino edited my proposal, you could see what kind of scope I intended for it.