There's been a lot of work on the XML to Object front in the latest versions of VisualWorks - there's a nice set of wizards that make it a lot easier to define and deploy a web services application. Our lead WS* developer, Tamara Kogan, asked me to post a tutorial presentation on this stuff - here it is. A small note - you will probably get some kind of warning about using IE when you browse that - I tested it with Firefox, and it works fine. I'd push up something in PDF, but I have no tools for that.
Update: As pointed out in the comments, many of the slides have issues in FireFox (and other browsers other than IE I'm sure, not to mention other platforms). I saved the slides as html from PowerPoint, and it looks like ActiveX is required. I'll happily make these available in a more easily accessible format if someone can tell me how to do that from the PowerPoint slides I have.
Update 2: See this post for the pdf versions I posted