szehau

Default Trackbacks is a wordpress plugin that sends trackback to the preset URLs. It is enhanced version of the old Default Trackback.
Features:
<ul>
<li>Send trackback to the URLs in the list when a post status is changed from “any” to “publish”.</li>
<li>Configure the trackback URLs under WordPress?s admin setting page.</li>
<li>Default setting for sending trackbacks (to send trackbacks by default or not each time publish a post).</li>
<li>Option to override default setting above at edit/new post page.</li>
</ul>

Default Trackbacks

This plugin will send trackbacks to URLs in the list ONLY when user publish a post or change the post status to publish.

mihai

This plugin will modify the links on pingbacks (and trackbacks) to remove the 
“external nofollow” for links to your own blog.
More info:
<ul>
<li><a href="http://patchlog.com/follow-self-pings/" rel="nofollow ugc">Follow Self Pings plugin</a>.</li>
<li>Check out the other <a href="http://patchlog.com/wordpress/" rel="nofollow ugc">WordPress plugins</a> by the same author.</li>
</ul>

Default Trackbacks vs Follow Self Pings