This plugin will allow you to attach a single file to multiple posts, but will also will allow you to detach any file.
<ul>
<li>Support http://xparkmedia.com/plugins/file-un-attach/</li>
<li>Languages http://xparkmedia.com/plugins/file-un-attach/#languages</li>
</ul>

File Un-Attach

This plugin will allow you to attach a single file to multiple posts, but will also will allow you to detach any file.

rajuru

Using this plugin you can show RSS Feed inside any post. The RSS will be loaded when post is loaded so you can show dynamic relevant contents through RSS feeds.
This plugin uses WordPress’s built in feed handling functions that also uses cache.
Read details on http://hungrycoder.xenexbd.com/?p=865

File Un-Attach vs In Post RSS Feed