I wrote an XSLT stylesheet that could turn an XHTML document into a display of its own source, complete with indenting, code folding and syntax highlighting. I

I wrote an XSLT stylesheet that could turn an XHTML document into a display of its own source, complete with indenting, code folding and syntax highlighting. I was quite pleased with that :) When I worked at the BMJ all of our content was stored as XML and rendered to the browser using XSLT, although this was done on the back-end and the resulting XHTML embedded in our various Spring applications. This sort of thing is probably the most common use of XHTML today...