Joost de Valk

Adds a simple to use [rss] shortcode with a couple of options:
<ul>
<li>feed, to put in the feed URL</li>
<li>num, to specify the number of items to show, defaults to 5</li>
<li>excerpt (true|false), whether to show an excerpt or not, defaults to true</li>
<li>target (defaults to none), to make links open in a new page (might break your html validity if under a strict doctype)</li>
</ul>
Example use:
[rss feed=”http://yoast.com/feed/” num=”10″ excerpt=”false”]
Or:
[rss feed=”http://yoast.com/feed/” num=”5″ excerpt=”true” target=”_blank”]
<ul>
<li>Find out more about the <a href="http://yoast.com/wordpress/rss-shortcode/" rel="nofollow ugc">RSS Shortcode</a> plugin</li>
<li>Check out the other <a href="http://yoast.com/wordpress/" rel="nofollow ugc">WordPress plugins</a> by the author</li>
</ul>

RSS Shortcode

Simple plugin to show RSS feeds in posts and pages using a shortcode.

Meredith Matthews

This plugin gives you two new shortcodes: [killinfeed] will prevent whatever it\’s wrapped around from being included in your site\’s RSS feed, and [addtofeed] will add exclusive feed-only content. It\’s especially useful for wrapping around multimedia shortcodes that are adding bits and pieces of the media player into your feed, or for making content exclusive to only one consuming audience. For example, you could use it to display an ad on your site but not in your RSS feed, or show an exclusive link or promotion to your podcast subscribers but not to your website visitors. Thanks to Daniel J. Lewis for updates!(https://github.com/theDanielJLewis)

WP Kill In Feed

Super-simple shortcodes to control what's in your RSS feed.

RSS Shortcode vs WP Kill In Feed