I like that idea of using OpenOffice. The nice thing about docbook is that it makes it easy to generate all of the documentation in to HTML at once. I dont know how or if you can script OpenOffice to convert everything to HTML to be published on the web.
What is the advantage of using OpenOffice files, publishing them to HTML over the use of a Wiki?
An immediate advantage of the Wiki over such is a system is the ease of linking between pages. And publishing is instantaneous and easy.
Cheers Jason