So I was trying to make my site xhtml 1.0 strict compliant and my embedded youtube videos were breaking it. I do try to be standards compliant and only with my new theme have i gotten into xhtml for slantview.com.
Well, as it turns out, there is a great article over at http://www.wimpyplayer.com/support/faqs/docs/general_xhtml_compliance.html about this very topic...