George Nagy

FilterFlex

A powerful plugin for applying filters to various WordPress elements with custom field support and dynamic tag replacement.

windyjonas

Add an info box to posts. Only displayed on single posts pages, You can include:
<ul>
<li>Title</li>
<li>Lead in, free text below title</li>
<li>Bullet list, max number of items is configurable</li>
<li>Copy, free text below list</li>
</ul>
Use the included css, or put your own wp-infobox.css in your theme directory.
Requires php5!

FilterFlex vs WP-Infobox