Add Multiple Users provides the ability for WordPress administrators to bulk register users using a range of tools available under
the AMU tab in your WordPress administration section.
Functions include the ability to manually input new user information, convert CSV data to user information, and
create users from a list of email addresses. Each new user registration can include almost all available standard user meta fields
plus any additional meta fields you require.
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, plus additional Network settings to restrict user functions and monitor user registrations
across your sites.
For more information please see the plugin page at http://addmultipleusers.happynuclear.com/