I see that "father of Lotus Notes" Ray Ozzie has started off a new weblog at MSN Spaces and in it has just outlined a very interesting major extension of the RSS feed concept called Simple Sharing Extensions (or SSE). So it may be that the acronynym gets yet another meaning, namely "Really Simple Sharing."
This could prove to be a real winner, if it catches on and can be made to work effortlessly -- particularly if it becomes an open standard.
If done right, SSE could provide a generic and non-proprietary form of two-way synchronization between any two sources.
I'm a big fan of the excellent Lotus Notes replication model (particularly since Release 4, when replication became sensitive to field-level changes not just document-level changes). Notes replication of course is quite proprietary, so it would be great if SSE provides a form of non-proprietary replication between foreign sources.
Ray points out the draft spec for SSE (somewhat abstruse as are all such specification documents), and Frequently Asked Questions (this is quite informative).