Mailing lists:

cgal-develop-l@postino.mpi-sb.mpg.de (best sent as blind carbon copy)
cgal-discuss-l@postino.mpi-sb.mpg.de
cgal-announce-l@postino.mpi-sb.mpg.de
compgeom-announce@research.bell-labs.com
general-topics@SolidModeling.org     (did not work for 3.0)


newsgroups:

( Better send as small cross-post blocks,
  otherwise it gets filtered out somewhere... )

sci.engr,
sci.image.processing,
sci.math
sci.math.num-analysis

comp.graphics.algorithms,
comp.graphics.visualization,
comp.graphics.animation,
comp.graphics.api.opengl

comp.programming,
comp.robotics.misc,

Moderated newsgroups:

comp.simulation,
comp.robotics.research