Being able to classify your members into different types is a handy way to make sure each is getting what they need. It may also help one see what sort of mix is best for their community. (Note: Most taxonomies are fraught with complexities, so YMMV)
D Ganley, et al (*) puts forth the following kinds of members: Utility Posters, Team Players, Low Profiles, Story Tellers, and Ghosts.
Recognize anyone?
Who are these people? What might a community consist of, and how could we cater to these different types of members? D Ganley, et al go into more details-