Q42 has finally released the commercial version of their browser based XML editor xopus (no COM components, this thing is a pure DHTML based WYSIWYG XML editor). Xopus is pretty slick, although its architecture makes it difficult to integrate with .NET (not impossible though, I posted a bit of code a while back to do this with an older version)... unless of course you were creating a DHTML based SOA, in which case you would probably have much better luck... it is just those darn postbacks and server controls that don't fit their model.