mountbatt

This plugin adds a separator between the intro text and the extended (more…) text of the content of a post. It simply replaces the span id more tag with the separator that is set in the plugins php file.
Some separator samples are given there.
Upload into the /plugins directory and activate it in the Plugins Menu.
History:
1.1:
Fixed a bug that forced WordPress Adminmenu to show a white blank page.
1.0:
Initial Release

Add a Separator

Simple Plugin to add a separator between the intro and the (more...) content.

Brijesh Mishra

Show required content and let user click on read more. Visitors will see readmore link on the page, when they will click, rest of the content appear with very simple animation on the same page.
Features
<ul>
<li>This plugin will effect only on pages</li>
<li>Select check box to show read more on the pages</li>
<li>Control option shows on all pages, you can select to show readmore on the page</li>
<li>Define the width to show from the page.</li>
<li>Very simple and easy to use</li>
</ul>

ReadMore ReadLess

ReadMore ReadLess will hide content on page.  Clicking on readmore will show complete page without refreshing the page.

Add a Separator vs ReadMore ReadLess