I enjoy the Living Science yahoo group very much, in my opinion it is one of the most useful and informative yahoo groups I have joined – but be aware, it is a secular group. At Home Science is another good group, while it is not strictly secular, you can read in its description that it discourages the young earth/creationist viewpoint. Both these groups are good, as far as I am concerned, since I teach the science of evolution, but many on this board do not, so I offer that info to help you all make your decision about whether or not to join these groups. Both are very “on topic” and not too many posts that it is overwhelming to read. Both have good, active moderators. The Living Science group has a one weekend a month curriculum sale time for members, so the group is not cluttered with sale notices all the time.
Hope that helps! Gem