OpenOffice [1] 1.1 beta now supports DocBook [2] Import/Export as indicated by the feature list [3].

[1] http://www.openoffice.org
[2] http://www.docbook.org/
[3] http://www.openoffice.org/dev_docs/source/1.1beta/features.html

1dok.org[1] works on an open standard for free and unimpeded exchange of electronic documents via internet.

[1] http://www.1dok.org/eng/index.html

In case you haven’t already heard: The OASIS standardization organization founded a TC to create an open, XML-based file format specification for office applications.[1]

[1] http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=office

“This year’s upcoming debut of Microsoft Office 11 will mark the start of a long process of education and adaptation. […] So here we’ll explore how existing Office documents can benefit from the new features, how developers will prepare XML-aware Office templates, and how users will apply them to create and analyze XML data.”
http://infoworld.com/article/03/02/21/08plofficexml_1.html?s=tc