WordPress.org

Add Multiple Users provides the ability for WordPress administrators bulk add WordPress user registrations using a range of tools available as an extra admin page under your Users tab in the administration section.

Each new user can have a custom username, a customised or randomly generated password, an email address, first name, last name and website data added upon registration. A range of settings allow the customisation of user notifications, validation checks and more.

Functions include the ability to manually input new user information, convert a CSV or Text file to user information, and create users from a list of email addresses.

In a WordPress Multisite installation, the plugin also allows the bulk adding of existing users from the Network to the specified site that the plugin is accessed from.

For more information please see the plugin page at http://www.happynuclear.com/sandbox/amu/add-multiple-users-for-wordpress.php