Create nodes by email!
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.