<xsl:template match="*">
	<xsl:choose>
		<xsl:when test="@id">
			<xsl:value-of select="@id"/>
		</xsl:test>      
		<xsl:otherwise>
			<xsl:value-of select="."/>		
		</xsl:otherwise>
	</xsl:choose>
		<xsl:apply-templates/>
</xsl:template>

<!-- negate the default text template -->
<xsl:template match="text()" />


should work (though I haven't tested it)

Rgs,

Ben


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