I tried to get it working in SDLMame/SDLMess. There are probably bugs (for sure there are because I don't think it works with the NTSC shader...), but it works pretty well any way. They may be fundamental errors because I'm not a programmer, don't really know how the GLSL system in MAME/MESS works, and I am easily confused by texture coordinates.
The shader's best features, IMO, are an aperture pattern that looks better than others I've seen and a sharpness parameter that is easily tweaked to your liking.
It also supports tweakable screen curvature, scanline darkness, and aperture pattern brightness.
I added a few possibly stupid things to the original shader: scanline varies with pixel intensity, contrast/gamma boost to help offset the natural image darkening of the aperture effect, a modification to the way sharpness works so that it is a little more consistent between drivers, and YUV saturation and tint settings.
If you use SDLMAME or SDLMESS with GLSL shaders, then you might want to check it out.
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Tried to get Timothy Lottes' CRT Shader working with SDLMAME.