Correctly implement the 'send nodes' perm so that the send_node module uses it to validate access.

Retain the input format configured for a given template, but allow it to be overridden by an administrator during a message edit activity.

Probable workaround for #902398 - fatal error at creating ubercart products with send a friend enabled

  pages.

and don't show it on the actual send page.

  the new mechanism of extended profiles.  Accounts from global, per-nodetype
  and per-node settings, and should preserve all those configurations.

  to/from default values for send profiles.

$profile->message and/or profile->content['message'].

This makes our forms consistent across various simple/complex form
configurations and can support some advanced theming/templating.

  "Send to friend" and advanced (e.g. sending through the news module)
  operations.
- In particular, correctly retain the node and message-ordering preferences
  across compose / edit behaviors.

  be derived as needed.

  that are being created / updated.

  state across form button presses and AHAH submissions.

  send.form.inc into the send handler proper.  This will allow us to override
  behavior and handle validation/processing where it lives.