z720

A basic default category plugin. 
The main purpose of this plugin is to provide different default categories on a per user basis.
I was looking for a plugin to set a different default category for my flickr posts (through XMLRPC API). 
And there was no built-in function to set a default category to a particular user.
This plugin is very simple :
<ul>
<li>any author can set it’s own default category (user can <code>edit_posts</code>)</li>
<li>any admin can modify an author default category (user can <code>edit_user</code>)</li>
<li>anywhere in WordPress a user get it’s default category where applicable : posts, API posts, … except in the writing settings page</li>
</ul>

Author Default Category

Any author (user can edit posts) can set its own default category on his profil page.

Rob Scott

The XMLRPC Pingback Ping can potentially be used as part of a DDOS attack. 
If you do not need the functionality, this plugin will use core functions to disable it.

Eazy XMLRPC Pingback Disable

This plugin disables the WordPress XMLRPC pingback ping.

Author Default Category vs Eazy XMLRPC Pingback Disable