JFrankParnell

<p>This plugin lists all your posts and displays checkboxes for all your currently registered categories.  You can check or uncheck categories and then hit any one of the submit buttons and your posts will be put into the categories you’ve chosen</p>
<ul>
<li>I’ve used this for 200 posts.  I dont really know what will happen if you try to change 2000 posts at a time.</li>
<li>I am going to try to implement a paging feature so that huge post lists wont crash anything.</li>
<li>The compatability i’ve listed simply means it’s what i’ve used it on.  This will probly work on any >3 wp version.</li>
<li>If it works for you, please click ‘works’ on the right over there.  If it doesnt, start a thread on the support tab 🙂</li>
</ul>
<h3>Arbitrary section</h3>
<p>Well, this is pretty abitrare.</p>


Mass set Categories

jroakes

<p>This plugin will give you the ability to pull up any (non-Super Admin) user and in one click add that user(with a global role) to all sites in your MU install.  Likewise, if you want to remove a user from all sites it is one click as well.  CAUTION: WordPress has an optional mechanism when deleting a user from a site that will allow you to assign that users posts to another user.  I have ignored this for this release.  Please take a DB backups until you are used to this plugin and Multi-Site.</p>


Multi-Site User Replicator 3000

WP3.1 multisite "mu-plugin" that allows you to add a user to all sites or no sites. Just drop in mu-plugins.

Mass set Categories vs Multi-Site User Replicator 3000