... and I would really hate to see anyone draw that implication from my recent career move. In fact, they're doing some very interesting cutting edge things using semantic technologies for real-world information integration. They may well make some breakthroughs in this area to rival their pioneering work to support XML natively in an industrial-strength DBMS 5 years ago. Perhaps more importantly, they're committed to building this ontology-based stuff into real business solutions and services, not just selling it to geeks.
My personal interests are more in the core XML specs and the technologies that allow regular developers to use them -- APIs, XPath/XQuery/XSLT, and the new generation of languages in which XML data is a first class citizen. Helping make sense of all this has been pretty much what I did for fun on xml-dev at night, and MS gives me a pretty exciting opportunity to do this for real.