Anyone already mentioned DocBook? (I am sorry if I mention it again if someone already did) It is an Oasis-standard. Here a list of others who use it: http://wiki.docbook.org/topic/WhoUsesDocBook
People can format the layout as they like in any file-format they like. Eventually a standaard PDF can be created for people who do not need or like to do extra work. I write my documentation very often in DocBook, and OxygenXMLEditor exports it to PDF Some interesting reading: DocBook XSL: The Complete Guide, by Bob Stayton: http://www.sagehill.net/docbookxsl/index.html Bert
