Erunafailaro

This plugin is intended to make the comment-moderation for the blog-owner a little bit easier. It does not detect comment-spam on its own. To successfully prevent spam, it should be used as an addition to the spam-protection provided by Akismet and Spam Karma.
This plugin adds a small button to every comment. This button will only be visibly to a logged-in blog-admin (that is a registered user with a user-level of 10).
When you press this button, the URI of the commenter will be replaced by the URI you can specify at the plugin?s option-page.
<h3>Plugin Homepage</h3>
The complete documentation is located at my website: http://www.weinschenker.name/comment-url-control/

Comment URL Control

This plugin will allow you to remove an unwanted author-URI entered by a commenter with one single click of your mouse.

scottsm

For a while, I’ve been a bit annoyed with WordPress losing pings (those automatic links on your blog when someone links to you) anytime someone links to more than one of my posts. It turns out WordPress’s comment flood prevention is getting in the way. This plugin prevents WordPress from discarding these pings.

WP_PingPreserver

Prevents WordPress from eating pings that come too quickly in succession (i.e. a single post linking to more than one of your pages).

Comment URL Control vs WP_PingPreserver