This is release 0.9 of my plugin, which already gives some nice options for managing your users. Did you know, how many users in your communiy use the registration form, but never do a click on the validation link in there e-mail? Simply look at "Not activated users" and delete these dead records, if you like.

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The plugin is for admins and for normal users; admins of course have options, like delete or edit user data.

The instruction manual comes in form of some screenshots with comments. Please have a view at the following images.

The last picture shows a planned feature, the SMS functionality of the plugin.