Google groups (
http://groups.google.com/) is really easy to use, I've discovered--if you don't have a newsreader set up, it's a more than adequate substitute.
Groups we have posted to:
- soc.history.moderated
- soc.religion.christian.bible-study
- humanities.classics
- humanities.lit.authors.shakespeare
- sci.physics.relativity
- sci.stat.math
- sci.econ
- sci.anthropology
- See also : Building Wikipedia membership