<xsl:function name="jc:cleanString" as="xs:string">
     <xsl:param name="string"/>
     <xsl:variable name="cleanedString">
     <xsl:analyze-string select="lower-case(normalize-space($string))"
regex="[a-zA-Z0-9\s]+">
         <xsl:matching-substring><xsl:value-of select="translate(., '
', '_')"/></xsl:matching-substring>
         <xsl:non-matching-substring/>
     </xsl:analyze-string>
     </xsl:variable>
     <xsl:value-of select="$cleanedString"/>
  </xsl:function>

a) Am I doing this in a good way? Anything I've overlooked? (Always
happy to get tips on making things that already work better!)

	Martin Honnen
	http://msmvps.com/blogs/martin_honnen/