Stephanie Leary

<p>This plugin appends the author’s display name to posts and/or pages. There is an option to turn off the display on your own site, so the signature is visible only in feeds and crossposted content.</p>


Post Signature

Appends the post author's display name to posts. Useful for multi-author blogs that are crossposted elsewhere, such as LiveJournal or Facebook.

Randy Hunt

<p>Crossposterous will cross-post your WordPress blog post to your Posterous site. You can choose whether to post a teaser with a link back your WordPress blog post or cross-post the full content.</p>
<h3>Configuration</h3>
<ol>
<li>Enter your Posterous email and password (used to log into http://posterous.com)</li>
<li>Select the site from the drop-down</li>
<li>Chose “Link back to post” or “Post full content”</li>
</ol>


Crossposterous

WordPress to Posterous cross-posting plugin.

Post Signature vs Crossposterous