After seeing the results I decided to clean the Twitter feed up a bit.  This is a bit better in my mind:

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" indent="yes"/>

<xsl:template match="rss/channel">

<h3>Latest messages from the <a href="{link}"><xsl:call-template name="removeBrand"><xsl:with-param name="title" select="title" /></xsl:call-template></a> feed.</h3>

  <xsl:for-each select="item[position() &lt; 11]">
  <div class="twitterEntry">
     <p><xsl:call-template name="removeName"><xsl:with-param name="title" select="title" /></xsl:call-template><br />
   <i>posted: <xsl:call-template name="getDate"><xsl:with-param name="dateTime" select="pubDate" /></xsl:call-template></i></p>
  </div>
  </xsl:for-each>

</xsl:template>

<!-- this removes the "Twitter /" string from the feed title -->
<xsl:template name="removeBrand">
  <xsl:param name="title" />
  <xsl:value-of select="substring-after($title,'/ ')" />
</xsl:template>

<!-- this removes the redundant feed title from the posting -->
<xsl:template name="removeName">
  <xsl:param name="title" />
  <xsl:value-of select="substring-after($title,': ')" />
</xsl:template>

<!-- this formats the date -->
<xsl:template name="getDate">
  <xsl:param name="dateTime" />
  <xsl:value-of select="substring($dateTime,9,4)" />
  <xsl:value-of select="substring($dateTime,6,2)" />
  <xsl:text>,</xsl:text>
  <xsl:value-of select="substring($dateTime,12,14)" />
</xsl:template>

</xsl:stylesheet>