Today the Syntext corporation announced that they are going to release the cross-platform, freeware version of their WYSIWYG xml doc editor as Open Source software. I don't know the exact terms of the license, but I am hoping that they will be terms that will allow for redistribution via {regular linux distro} repositories.

It looks like it is java-based, which does mean that it will have funky icons and might be a little on the "heavy on the resource usage" side of things, but it's certainly something that will help people with authoring structured content without having to know all of the ins-and-outs of the code.