Option to not use e-mail for sending users passwords

Drupal should have an option to either allow users to input their own password when creating their account, or create them a password which is shown on screen rather than e-mailed. This is needed for intranet sites which don't handle mail, and has been requested in the fora on drupal.org at least twice (e.g. http://drupal.org/node/view/1959).