Phil Windley writes:
SSE stands for simple sharing extensions to RSS and OPML.
The spec is doing a few things from my perspective: (1) SSE brings RSS on par with Atom (which is already bi-directional) and ups the ante in certain ways. (2) SSE keeps RSS in the ballgame. I think having battling standards in this area is not a bad thing right now. But, there’s something more important.
RSS has had a big impact on how Web 2.0 has played out. If you discount XHTML, RSS may be the most (some would say only) popular XML format in use outside the firewall. Even so, RSS’ (and Atom’s) future may be even brighter.