want

1. Title must be optional.
2. Saving must be automatic.
3. Must allow multiple edit tabs to be open at once.
4. Tagging and crossreferencing preferred.

For me, it should be the one place for everything. This implies, if done with one content type, possibly having an optional date field, a private textarea...

Background:

Ideally the tabs would be vertical, and somehow in the application, but really it can just use the browser's tabs.

This would be quite useful functionality, and i'm sure i've seen it implemented or at least requested somewhere.

In effect, it makes the hierarchy in a vocabulary just an organizing tool, preventing the grouping labels higher in the hierarchy from being used as terms.

A simple module could check for integer in the first part of the argument and send to the node ID for a very simple way of shortening URLs on a Drupal site.

Done (and then some) in Drupal 6 with this module: http://drupal.org/project/shurly

Done in Drupal 7 here: http://www.metaltoad.com/blog/url-shorteners-must-die