HowWhoWhen

Add To Post allows you to add additional content to either the start, end or both areas of your blog posts. You can use it to add AdSense code, opt-in forms or notifications such as disclaimers and disclosures to all your posts.
Demo: <a href="http://www.get10000subscribers.com/" title="Get 10,000 Subscribers" rel="nofollow ugc">Get 10,000 Subscribers</a>.

Add To Post

Add To Post allows you to add additional content to either the start, end or both areas of your blog posts.

frenchsquared

This plugin will add items from an rss feed to your blog. 
The items will show after the content on your single post. 
The will pull new content every time the page loads thus 
helping with Google Rank since you will have new content on your 
single post pages.
Enjoy! 
 Gordon French

RSS to Post

RSS-to-post will add a items from an RSS Feed to the bottom of your post content.

Add To Post vs RSS to Post