Mine

# Our "basic" anonymous configuration, including a single
# upload directory ("uploads")
<Anonymous ~ftp>

  # Allow logins if they are disabled above.
  <Limit LOGIN>
    AllowAll
  </Limit>

  # Maximum clients with message
  MaxClients                    5 "Sorry, max %m users -- try again later"

  User                          ftp
  Group                         ftp
  # We want clients to be able to login with "anonymous" as well as "ftp"
  UserAlias                     anonymous ftp

  # Limit WRITE everywhere in the anonymous chroot
  <Limit WRITE>
    DenyAll
  </Limit>

  # An upload directory that allows storing files but not retrieving
  # or creating directories.
  <Directory uploads/*>
    <Limit READ>
      DenyAll
    </Limit>

    <Limit STOR>
      AllowAll
    </Limit>
  </Directory>
</Anonymous>