Post nodes, comments, taxonomy, teasers & Blogs via E-mail.
Do you want to increase your site usage and encourage users to post?
Posting by emails and getting updates by emails are the two most important things IMO for a small community sites. It is certainly the prefered way.
Configuration required on webhost or mail host for.
1. Setting up an email address or mailbox.
It is a bit time consuming to set it up, but its worth it. Check out the details at
http://drupal.org/node/39172 ( For BLOG Posts by email)
After successful implementation of above, a good user documentation is need to let the users know how to post in various forums on the site.
1. Easy to remember email addresses needs to be set up.
2. You need not provide functionality to post in all forums, but allowing to post in few forums will also be a big plus.