Kendall Clark Grant wrote an article about XML Editors. My company is preparing to roll out a CMS using XMetal, I’ve played with Morphon a bit, and I saw a demo of Xopus at the plone conference. Simon St. Laurent recommends Topologi, which also looks good (and cheap). On the same page a link to a free online book Xform Essentials (by Oreilly). I’m interested in reading this book, as well as another book I received a review copy for Using XML for Legacy Business Applications.