The keys to rendering these types of feeds is in the transformation.  For example, I picked the feedburner link, and put together a simple xsl to render just the items.  It works fine for what it is, and you could do more with it, but you get the general idea.  You might have to play with it a bit if you cut'n'paste from here.  Sometimes things don't render like they should, but I've got it working on a DNNv3.2.0 test site.  Good Luck.

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" exclude-result-prefixes="xsl"
 xmlns:dc="http://purl.org/dc/elements/1.1/">
<xsl:output method="xml" omit-xml-declaration="yes" indent="yes"/>
<xsl:template match="/">
 <div>
  <xsl:apply-templates select="rss/channel"/>
  </div>
</xsl:template>
<xsl:template match="rss/channel">
  <xsl:apply-templates select="item"/>
</xsl:template>
<xsl:template match="item">
  <xsl:variable name="item_link" select="link"/>
  <xsl:variable name="item_title" select="description"/>
<div class="rssItemDescription">
 <xsl:value-of select="description" disable-output-escaping="yes"/>
</div>
<div class="rssItemSub">
 (<xsl:value-of select="pubDate"/>) <hr/> 
</div>
 </xsl:template>
</xsl:stylesheet>