Ray Osszie (Lotus Notes creator and Groove founder) introduces a new standard called SSE (Simple Sharing Extensions for RSS and OPML) meant to support sharing and 'cross-subscribed' feeds. It's actually a RSS extension. What's interesting is that the SSE specification is released under a Creative Commons license, which is a gooD thing for MS. The SSE FAQ is available (as well as the SSE specifications):

Simple Sharing Extensions (SSE) is a specification that extends RSS from unidirectional to bidirectional information flows. SSE defines the minimum extensions necessary to enable loosely cooperating applications to use RSS as the basis for item sharing—that is, the bidirectional, asynchronous replication of new and changed items among two or more cross-subscribed feeds. For example, SSE could be used to share your work calendar with your spouse. If your calendar were published to an SSE feed, changes to your work calendar could be replicated to your spouse's calendar, and vice versa. As a result, your spouse could see your work schedule and add new appointments, such as a parent-teacher meeting at the school, or a doctor's appointment.

Why do I blog this? RSS was already a huge achievement in terms of information management, then I'm curious about this SSE thing.