Hi!
I would like to add to this list:
The PostgreSQL manual which comes with the PostgreSQL 7.1 source
code. The source is available from http://www.postgresql.org (or one of
the mirrors).
I consider it valuable since it consists of a set of books, thus giving
you an example of how to create a large piece of documentation. It also
contains a reference manual showing you how to mark up Unix-style man
pages using DocBook.
In addition, the "doc" subdirectory of FreeBSD is a very good resource for
larger books marked up using DocBook. You can obtain it using anonymous
CVS access. See http://www.freebsd.org for details.
Greetings,
Holger
