loveless

Provides hooks that can be used within ‘The Loop’ to grab content from before and after the  tag. If no MORE tag is provided, it will return <code>the_excerpt()</code> and <code>the_content()</code> respectively. You can also use a function to access all content, regardless of MORE tag.
<h3>Current version</h3>
Current version: 1.2
<h3>Revision History</h3>
0.1 – made within the functions.php file of the theme 
0.5 – created the plugin, still required $post->post_content to be passed to functions 
1.0 – removed $post->post_content to be passed in. 
1.1 – fixed a bug that stopped <code>the_content()</code> from posting 
1.2 – added function to get all post content, regardless of MORE tag
<h3>GPL</h3>
Copyright 2008 Corey Dutson (email : cdutson@wallofscribbles.com)
This program is free software; you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation; either version 2 of the License, or 
(at your option) any later version.
This program is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
GNU General Public License for more details.
You should have received a copy of the GNU General Public License 
along with this program; if not, write to the Free Software 
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

PostDivider

Allows the user to select text before and after the MORE tag using custom hooks.

Angelo Mandato

Do more with the read more (<code></code>) Tag. This plugin makes all links below the (<code></code>) tag include the rel=”nofollow” attribute.
This plugin is ideal for blog posts that want to organize untrusted links below the <code></code> tag. This has become very important since the recent Google penguin and panda search algorithm changes.

Do More

Do more with the &lt;!--more--&gt; Tag, make all links below the &lt;!--more--&gt; tag include the rel="nofollow" attribute.

PostDivider vs Do More