All blogs on the WordPress.com platform and any WordPress.org blogs that opt-in (using this plug-in) will now make instant updates available to any RSS readers subscribed to a new feature called RSSCloud. There is currently only one RSS aggregator that supports RSSCloud, Dave Winer's brand-new reader River2. That will probably change very soon. Update: Within hours another RSS reader called LazyFeed has announced that it will support RSSCloud as well.

 

Via ReadWriteWeb

I am just starting to imagine the possibilities real time blog communication is going to bring.  This could be awesome!