> >> <xsl:output
> >>        indent="no"
> >>        method="xhtml"
> >>        doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
> >>        doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd
> >> " />

This is browser related, but I bet quite a few XSLers run into it.

The problem is if you output the page with the xml prolog (<?xml
version="1.0" encoding="utf-8"?>) IE6 will put you quirks mode. You
generally don't want to be in quirks mode when trying to achieve
consistency across browsers. So you can fix it by putting
omit-xml-declaration="yes" in you xsl:output.

IE7 does not do this. 

Cool, huh?