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With this plugin, you will be able to display an index with all your authorss, sort alphabeticaly. 
The shortcode is <code>[authorsindex]</code>.
Options are: 
 *ul => the class of you ul element (default = iapAlpha) 
 *li => the class of you li element (default = iapAlpha) 
 *letter => the class of you span element(the letters) (default = iapLetter) 
 *hide_empty => diplay authors that don’t have any article (default = false) 
 *optioncount => display number of post of the author (default = true) 
 *show_fullname => show full name of the author (default = false) 
 *exclude_admin => exclude the admin (default = false) 
 *menu => show a menu of the index (buddypress-like) (default = true) 
 *listpost => display a list of the post of the author in a nice tooltip
<h3>Demonstration</h3>
You can see an example of the functionnality of this plugin at <a href="http://kune.fr/index-des-auteurs/" title="Kune.fr Auteurs Index Page" rel="nofollow ugc">Kune.fr</a>
<h3>Changes</h3>
<ul>
<li>1.1 : Less bugs, one more option to display a list of post of the author in a nice tooltip</li>
<li>1.0 : First release of the plugin</li>
</ul>

Index Authors page

With this plugin, you will be able to display an index with all your authorss, sort alphabeticaly.

ridahost

list posts alphabetically: A plugin that provides an A-Z index of the posts displayed on a particular page or category based on the post title.After you activate the plugin, you do not have to do nothing .You will see the result.
This is very beta at the moment, it has only been tested . so don’t go mad if it doesn’t work for you. Let me know though.

A-Z Indexing startup

This is a simple plugin that provides an A-Z index of the posts displayed on a particular page based on the post title.

Index Authors page vs A-Z Indexing startup