Running a server used to require a higher degree in rocket science. Now any technical user can do it. In less than an hour. And get the immediate benefit of running a River of News and linkblogging tool. All multi-user. Ideal for a news organization, a department in school or business, for pennies a day. Or less. :-)
It's a multi-user RSS-based feed aggregator that supports all flavors of RSS including Atom, real-time feeds and it's a podcatcher. Your rivers are publications that help you define communities.
Radio2 is for linkblogging. A simple feed that can be plugged in anywhere you want your flow to go. To River2, of course, or to Twitter or Google Reader, or any other RSS-capable software.