gregsurname

This WPMU plugin creates under the Site Admin menu called “Bulk Create Blogs” where you can bulk create/add users to blogs.
To use the plugin you must create correctly formatted data. The plugin takes 
CSV formatted data where each row contains the following data.
<pre><code>domain, user_id, blog_title, blog_topic,
</code></pre>
Each of these fields is described below.
<ul>
<li>blog_domain (Mandatory): the domain name of the blog, this should only contain alphanumeric characters and be in all lowercase. If the blog domain is empty then users will be added to the site’s root blog.</li>
<li>user_name (Mandatory): the login id of the user to be added to the blog.</li>
<li>blog_title (Optional): the title of the blog.</li>
<li>blog_topic (Optional): the name of the blog topic that this blog will be categorised under. These topics are setup under the ‘Blog Topic Management’ tab. A blog_title must be chosen if you wish to set the blog topic. (Requires cets_blog_topics plugin.) </li>
</ul>
When each line is processed, if the blog named already exists then the user given 
is added to the blog. If the blog does not exist then it is created. If a blog title 
is not provided then the blog domain is used.
This plugin also provides support for LDAP user creation. If a user does not exist and 
the ldap_auth plugin is installed then it will attempt to create a new user.
At the moment this plugin only supports sites that use domain blog naming. Support for 
sub-directories is not planned but you could easily add it yourself.
The number of blogs that can be imported at a time is limited.

Bulk Create Blogs

A WPMU plugin for allowing the site admin to bulk create blogs using CSV data.

3dperuna

WPMU has great themes and plugins. Unfortunately, many, if not most, come with a nag notice that admins see about installing their notifications dashboard plugin. If you’ve bought one plugin for your site this is probably overkill. If you’re a developer you don’t need this on your client’s sites.
This is a simple plugin that removes the notice. The 1.3 version has been checked against WP 4.4 and recent WPMU plugins, but still should be backwards compatible with older versions of WPMU plugins.
Note: If you do decide to you install the WPMU notifications plugin, please deactivate this one first. Errors may occur if you don’t.
If you like this plugin consider donating: http://www.protospace.com/wpmu-no-nag-plugin/

Remove WPMU Dashboard Install Nag

Works as advertised. Now, why a plugin should be needed for this is another question altogether, and installing and activating this plugin is no substitute for filing an RFE to either add a close button to those annoying nags or a switch to turn them off (and their pref doesn't always work, apparently).
Thanks for this!



Simple and to the point

This plugin removes the nag notice at the top of WPMU plugins and themes.

Bulk Create Blogs vs Remove WPMU Dashboard Install Nag