After a few months of being dark, I'm back -- and far more interestingly, Avalon is back.  This release, available to MSDN subscribers, runs on XP, which delivers on the announcement made last August.  Check out the introduction that Tim Sneath, Arik Cohen and I wrote and start playing.  The product team is very interested in your feedback.  Expect more samples, tidbits, and whatnot in days to come.