DOCBOOK: A GUI-based tool for writing SGML/DocBook?

Hi,

DocBook and SGML do a good job, but it is really slow writing a book with
them by hand generating the SGML.

Are there any good tools, perhaps with a WYSIWYG type interface?


Regards
-------
Richard Sharpe, 
Samba (Team member, www.samba.org), Ethereal (Team member, www.zing.org)
Contributing author, SAMS Teach Yourself Samba in 24 Hours
Author, Special Edition, Using Samba