Posterous

To import your posts from Posterous, run:

$ ruby -rubygems -e 'require "jekyll-import";
    JekyllImport::Importers::Posterous.run({
      "email"     => "myemail",
      "password"  => "mypassword",
      "api_token" => "mytoken"
    })'

All three fields are required.

There is also an alternative Posterous migrator that maintains permalinks and attempts to import images too.