Boone Gorges

Requires WordPress 3.0+ Network Mode.
Allows blog administrators to add multiple users to blogs at a time, using only a list of email addresses. When the specified email address matches an existing account, the account will be added as a user on the blog. Otherwise a new account is created and the new user added with the specified role. Based on DDImportUsers.
The plugin determines username automatically from the email address. For example, the email address bgorges100@example.com will produce the email address bgorges100. For that reason, this plugin works best when used in schools or organizations with official, unique email addresses.
When BuddyPress is installed, the welcome email will also include a link to the new user’s Edit Profile screen.
This plugin was developed for Blogs@Baruch of Baruch College’s Bernard L Schwartz Communication Institute. http://blsciblogs.baruch.cuny.edu

Simple Import Users

Allows blog administrators to add multiple users to blogs at a time.

Yuya Hoshino

How it works:
<ol>
<li>
Click ‘Tools > Bulk Term Editor’.
</li>
<li>
Select a taxonomy. 
If you selected a taxonomy which has terms, it will read those into the field.
</li>
<li>
Get your data ready. 
Prepare your data by spreadsheet such as Excel. 
If you selected a taxonomy which has terms at the step 2, it’s easy to copy that data into the spreadsheet.
</li>
<li>
Copy the cells. 
You may copy all lines, but the more lines there are, the more times spends. 
Copying the minimum necessary lines is the best, but safer to copy all lines.
</li>
<li>
Paste to this plugin. 
Paste it into the ‘Term’ field of this plugin.
</li>
<li>
Execute. 
Clicking the ‘Edit’ button executes it.
</li>
</ol>
<h4>Delete</h4>
Entering a ‘*’ in beginning of line will delete.
<h4>Change the term slug</h4>
Entering a ‘>New slug’ after the term slug will change the term slug.
<h4>Add</h4>
When the term slug is a blank or new, add.

Bulk Term Editor

Just came here to say THANK YOU, this plugin is a very very handy and useful tool to manage BIG list of taxonomies. Thank you. 

Awesome Job! Thanks

You can register or edit terms in bulk. Copy cells in the spreadsheet, all that remains is to paste to this plugin.

Simple Import Users vs Bulk Term Editor