CQWP - ItemStyle - SiteUserInfoList - Client Object Model - ECMAScript

http://www.glynblogs.com/2010/11/viewing-raw-data-in-a-content-query-web-part.html

http://www.glynblogs.com/2010/11/display-a-users-picture-in-the-content-query-web-part.html

Debugging:
http://www.heathersolomon.com/blog/articles/customitemstyle.aspx

http://kyleschaeffer.com/sharepoint/sharepoint-2010-item-styles-and-ddwrt/

Other Resources

http://www.turhaltemizer.com/2010/10/sharepoint-2010-client-object-models.html

For Fields to Display, have this in Item Style.
Note: Give normal name with spaces there and in XSLT use _x005F_x0020_ for spaces.


<xsl:variable name="SafeLinkUrl">
       <xsl:call-template name="OuterTemplate.GetSafeLink">
            <xsl:with-param name="UrlColumnName" select="'LinkUrl'"/>
       </xsl:call-template>
  </xsl:variable>
  <xsl:variable name="DisplayTitle">
       <xsl:call-template name="OuterTemplate.GetTitle">
           <xsl:with-param name="Title" select="@Title"/>
           <xsl:with-param name="UrlColumnName" select="'LinkUrl'"/>
           <xsl:with-param name="UseFileName" select="1"/>
       </xsl:call-template>
  </xsl:variable>