I've been experimenting with DocBook here. Here are a couple of things that I've noticed when relying on the browser to do the XSL translations with the DocBook stylesheets.

• When rendering in IE, tables do not work. Check this out in IE.
• When rendering in Phoenix, the headings do not show up in the rest of the document, just the "TOC" at the top. Check here for an example, using Phoenix.

The real frustrating thing about the all of this is that some of it works in one browser, but not the other.