I've set a few clients up with Adobe (formerly Macromedia) Contribute to edit static html content. Add the comments to prevent them from causing too much damage and it works okay:
<!-- TemplateBeginEditable name="UserEditedSection" --> <p>stuff the user can edit</p> <!-- TemplateEndEditable -->
So my questions:
Are there any Contribute competitors that are worthwhile?
Are there any Contribute competitors that don't require a piece of desktop software?
Are there any Contribute competitors that work on mobile (iPad, iPhone, Android, Blackberry?)