mortenf

With Post Scriptum you can add configurable text or HTML to the end of each post. 
All the descriptions of each tag and category will be appended to the content of posts with those tags or categories.
The plugin does not require editing of theme template files.
<h3>License</h3>
Copyright (c) 2009 Morten Høybye Frederiksen <a href="mailto:morten@wasab.dk" rel="nofollow ugc">morten@wasab.dk</a>
Permission to use, copy, modify, and distribute this software for any 
purpose with or without fee is hereby granted, provided that the above 
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES 
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Post Scriptum

A simple plugin adding optional per-category and per-tag text/HTML at the end of the post content.

Prasanna SP

This plugin creates a new widget which lets you show a list of recent posts based on categories or tags. This is a must have plugin if you want to exclude some categories in recent posts widget or if you want to show recent posts based on tags. By default the wordpress recent posts widget shows a posts from all category. But this plugin gives you more power to customize your recent posts widget. You can also display post date in the widget.
See the live action of this plugin on <a href="http://demo.prasannasp.net/custom-recent-posts-widget/" rel="nofollow ugc">demo site</a> or on Kennneth John Odle’s <a href="http://blog.kjodle.net/" rel="nofollow ugc">blog</a>.
Have any questions or suggestions? Create a thread in the <a href="http://forum.prasannasp.net/forum/plugin-support/custom-recent-posts-widget/" rel="nofollow ugc">support forum</a>.
Visit <a href="http://www.prasannasp.net/wordpress-plugins/" rel="nofollow ugc">this page</a> for more WordPress Plugins from the developer.
A special thanks to <a href="http://blog.kjodle.net/" rel="nofollow ugc">Ken</a> and <a href="http://www.joshlobe.com" rel="nofollow ugc">Josh</a> for testing the code.

Custom Recent Posts Widget

A widget to show recent posts list based on categories or tags

Post Scriptum vs Custom Recent Posts Widget