Smileys is a text filter that substitutes ASCII smileys/smilies/emoticons with images.
This is a simple smiley-filter that allows the easy use of graphical smileys (or 'emoticons') on a Drupal site. It comes with a set of example smileys. An unlimited amount of custom smileys can be setup as well.
This is a wiki module. It implements a filter that provides basic structured
text formatting. Basically, the conventions (and much of the code) are taken
from phpwiki.sf.net.
Mailhandler uses Feeds to let you post nodes by email. It takes mail (usually from an IMAP mailbox) and imports it as whatever type of content you choose. Plug-in modules allow you to do more awesome things like post comments, select different authentication methods, and set properties such as published / sticky status using "commands". Hugely powerful and flexible, but includes a "quick-start" module to help get you started.