RSS WordPress plugins
The most popular blogging and CMS platform is by far WordPress. Here are a few key plugins you can use to get the most out of your RSS feed in WordPress.
FD Feedburner Plugin
Redirects all feeds to a Feedburner feed.
FeedBurner Widget
Adds a sidebar widget to easy customize and display your FeedBurner subscribers stats RSS button.
http://wordpress.org/extend/plugins/ozh-better-feed/
add a custom footer to RSS items with, for example, a copyright notice, a “Read More (400 words)” links, an “Add to del.icio.us” link, a list of related entries, or anything really (even custom PHP functions). Compatible with Feedburner or similar services.