Been reading through some of the links on simonstl.com. Some interesing presentations and thoughts. I dont agree with alot of what simon talks about such as Why I Don't Like RDF and Creating Schemas While Preserving Your Sanity Looking Beyond W3C XML Schema, which explores why to abandon W3C XML Schema in favor of RELAX NG and Schematron. I do however love his playmobil style of presentations.
Other presentations are worth looking at including, Microsoft Office and XML.