Christian, this is exactly the same question as you asked before. Again you need XSLT knowledge, at the main idea is still available you you in this thread: http://www.dotnetnuke.com/Community/Forums/tabid/795/forumid/56/threadid/178257/scope/posts/Default.aspx

I am aware that this did not help you in the past, though here is now the concrete script for your todays request:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:udt="DotNetNuke/UserDefinedTable" exclude-result-prefixes="udt">
  <xsl:output method="xml" indent="yes" omit-xml-declaration="yes" />
 
   <xsl:template match="udt:Data" mode="list">
    <xsl:value-of select="udt:Name" disable-output-escaping="yes" />
  </xsl:template>

  <xsl:template match="/udt:UserDefinedTable">
    <xsl:if test="udt:Data">
      <table>
        <xsl:for-each select="udt:Data[position() mod 3 = 1]">
          <xsl:variable name="row" select="position()" />
          <tr class="Normal">
            <td>
              <xsl:apply-templates select="." mode="list" />
            </td>
            <td>
              <xsl:apply-templates select="../udt:Data[($row -1)*3 +2]" mode="list" />
            </td>
            <td>
              <xsl:apply-templates select="../udt:Data[($row -1)*3 +3]" mode="list" />
            </td>
          </tr>
        </xsl:for-each>
      </table>
    </xsl:if>
  </xsl:template>
 
</xsl:stylesheet>