I have found a possable bug in the dri implementation of glPointSize() ... it doesn't seem to work at all. I'm using the radeon.o drm and the r200 mesa drivers.
The source I was trying (and works perfectly in windows) is located at the bottom of this page http://www.opengl.org/developers/code/mjktips/particles/
There is no difference at all in all 3 size selections of the particles (2.0, 4.0 and 8.0) using glPointSize()
Have you tried glGet( GL_POINT_SIZE_MAX ) ?
You'll find it set to 1.0 because that is the largest the hardware will directly support.
There was a thread a few months ago concerning writing a useful fallback path (ie not swrast) that generated larger points with various primitives. I don't think it actually reached a point where I saw a patch ready for inclusion in CVS, however.
Keith
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