Here are some articles.
(All of them are written in Docbook-XML and converted with Docbook-XSL.)
japanese translations:
- IPsec HOWTO [ original, archive]
- Structured Editing in Emacs [ original, archive]
- Fluxbox doc: I sent my translation to upstream; (Fluxbox documentation - Japanese translation, local archive cache - tar+bz2). [ original is found at docpage / the official site]