Jirka Kosek has written another spectacular article for XML.com entitled "Automated Tree Drawing: XSLT and SVG."
What's really cool, is that he's embedded the tree markup in a DocBook document, and then used a customization layer for the DocBook Stylesheets to render it!
Here's an example from the article:
I think this would be extremely handy if you need to describe any kind of hierarchy. Hopefully, you are already using the industry standard DocBook or Simplified DocBook schemas for your computer hardware or software documentation...
See also: DocBook