hazardcell

A newer version for WP3.0 is in the works. I would have loved to release it on time for the release of 3.0 but I’m having my finals at the moment so it will have to wait until June 2010. Will include single sign-on as well.
This plugin is for WordPress MU
This plugin basically allows you to host blogs on multiple domain names while maintaining one main site.
For example, the main site could be example.com but users will also be able to sign up for blogs on example.net, example.org or any other domain name that you choose to add.
<ul>
<li>All the sites will have the same settings</li>
<li>No extra blogs/tables are created for the additional domain names</li>
<li>All blogs will be viewable on the Site Admin blog list</li>
</ul>
Alternatively, if you would like to request a feature and/or report a bug, please visit the <a href="https://wordpress.org/tags/yet-another-multi-site-manager" rel="ugc">forum</a> or the <a href="https://plugins.trac.wordpress.org/browser/yet-another-multi-site-manager/" rel="nofollow ugc">trac repository</a>. You will have to login with your WordPress.org username and password to access these.
<h3>Known Issues/Limitations</h3>
<ul>
<li>Remote login does not work with this version</li>
<li>Only tested with VHOST installs in root directory</li>
</ul>

Yet Another Multi-Site Manager

Allows blogs to be created on multiple domain names while maintaining only one main site for all domain names.

Luke Gedeon

Matthew Gedeon

Increases productivity for Multi-Site administrators. 
This is an admin site site switcher enabling you, the admin of multiple sites, to select any one of them and go directly to the equivalent page of that site.
For example, you are working on a site named “Penguin” turning on plugins, and you realize that site two (Which we will name “Linx”) has a plugin that needs to be turned on too.
Simply select “Linx” from the drop down box immediately behind the title of your site(Penguin), and it will take you to the plugin page of Linx. This lite plugin has saved myself and others hours of productive time. It’s a must have for any multi-site administrator.
<h3>Readme Generator</h3>
This Readme file was generated using <a href='http://sudarmuthu.com/wordpress/wp-readme' rel="nofollow ugc">wp-readme</a>, which generates readme files for WordPress Plugins.

Admin Site Switcher

This creates a drop-down list of all sites in a multi-site install and lets you switch to the corresponding admin page of the other site.

Yet Another Multi-Site Manager vs Admin Site Switcher