I suggest you go to your sidebar.php and either at the top under the first
or at the end before the closing
add something like this:
<li id="Your_RSS_Title" class="widget widget_text">
<h2 class="widgettitle">YOUR RSS TITLE</h2>
<div class="textwidget">
<ul>
<li><a href="http://ADDRESS TO YOUR RSS FEED" title="YOUR RSS TITLE" target="_blank"><img src="http://ADDRESS TO YOUR RSS IMAGE" width="IMAGE WIDTH" height="IMAGE HEIGHT" border="0" alt="Subscibe to RSS Feed" />Subscribe to RSS Feed</a>
</li>
</ul>
</div>
</li>
This will create a title and then below it an image with your text.
I have used this extensively at my blog and you can see examples of it at http://blog.tierrahosting.com
ooppss it cut the unordered list tags,
Go to your sidebar.php and either at the top under the first <ul> or at the end before the closing </ul> add the code I posted above.
Hope this helps!
You could create a text link to your feedburner feed, and from there people can add your RSS feed to whichever platform they want to use.
Search for the Feedburner Feedsmith plugin.
http://www.google.com/support/feedburner/bin/answer.py?answer=78483&topic=13252
