Klaatu introduces you to Publican, the user-friendly Perl frontend to Docbook XML from the Fedora Linux Project. Also, how to set up vim with XML tag completion.
Also see Docbook The Definitive Guide
nXML-mode for GNU Emacs.
Feel free to glance over the dot-emacs file that Klaatu uses, mostly stolen from Unix guru Bill Von Hagen (who in turn stole it from lots of other people; read comments for credits)
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