Every time you modify a post slug, add a new post, rename a category, or otherwise modify any of your post and page permalinks, jadedcoder Sticky Permalinks (jcsp) will keep a copy of the original permalink along with the post or page it originally led to. If anyone tries to access the old URL, they will be redirected right to the new one, no matter how many times you’ve changed it.
If you re-use a URL that has already been used in the past, its copy will be replaced and it will safely link to the new article instead.
Don’t throw away valuable URLs! This plugin lets you re-organize your site as many times as you want, without risking traffic loss.

jadedcoder Sticky Permalinks

Keeps a history of your permalinks no matter what changes you make on your site, and redirects old links to the new ones.

lerougeliet

RSS Feed Styles improves the appearance of your RSS feeds and make them human-readable. View the screenshots to see the before and after. RSS Feed Styles also adds subscription buttons and social sharing buttons to your RSS Feeds. This allows users to share your posts without an RSS reader.
Your blog’s RSS feed is located at http://yoursite.com/feed/ (if you use permalinks) or http://yoursite.com/?feed=rss2 (if you don’t use permalinks).
Some users already have an RSS viewer installed on their browsers, so their RSS feeds are already human-readable. However, most users (especially on Google Chrome or Apple Safari) do not have an RSS viewer. This plugin makes your RSS feeds accessible to those users.
Currently supported feed readers:
<ul>
<li>Digg Reader</li>
<li>Feedly</li>
<li>Inoreader</li>
<li>AOL Reader</li>
<li>The Old Reader</li>
<li>NewsBlur</li>
</ul>
Currently supported sharing buttons:
<ul>
<li>Facebook</li>
<li>Google+</li>
<li>Twitter</li>
<li>Pinterest</li>
<li>Evernote</li>
<li>LinkedIn</li>
<li>Tumblr</li>
<li>Reddit</li>
</ul>

RSS Feed Styles

Makes your RSS feeds human-readable. Check out before and after screenshots »

jadedcoder Sticky Permalinks vs RSS Feed Styles