Dave is at Gnomedex today, but he's posting the news that tomorrow Microsoft will demo their extensive browser support of RSS. Initially, when MS contacted Dave, he assumed that they were only interested in managing lists of browser bookmarks using RSS, but as it turns out they have a dedicated team for development of RSS.
On Friday you'll see how deeply integrated RSS is in the architecture of the browser. But that's just the tip of what may turn out to be a very big iceberg. The people at Microsoft noticed something that I had seen, only peripherally -- that there were applications of RSS that aren't about news. Like Audible's NY Times Best Seller list, or an iTunes music playlist, or lists of Sharepoint documents, or browser bookmarks. Lists are all over the place, and people are starting to move them around via RSS, and they are not the usual kind of data that has been carried by RSS in the past.
Dave says that the OPML editor he's developing "will support the very simple extensions to RSS that they are developing, and I look forward to collaborating on further extensions and perhaps even new formats as we go forward."