Content providers listed by category

• Online communities / 
• Mailing Lists / 

Links

1. ---

   The Natural Life Cycle of Mailing Lists
   Every list seems to go through the same cycle
   http://oii.org/lists/lifecycle.html

2. ---

   Mail Archive
   Archiving service for public mailing lists
   http://www.mail-archive.com/

3. ---

   Big Mailing Lists - Comprehensive Details
   Big-Mailing-Lists.com has a database that is continuously expanding and including details of personnel in various fields.
   http://www.big-mailing-lists.com/