GeoRSS ::
Geographically Encoded Objects for RSS feeds

GeoRSS Implementations & Policy References

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Software (from oldest to newest)

Worldkit
http://worldkit.org/

worldKit is an easy to use and flexible mapping application for the Web. Light weight GIS. It's a SWF based app, configured by XML, data fed by RSS. Stand-alone use or integration in larger projects. [Simple]

Cadcorp SIS
http://www.cadcorp.com/

Cadcorp will be releasing a Plug-in, and an updated version of our free Map Browser OGC W*S client that can use it, sometime soon.  The Plug-in supports: Simple and GML profiles; point, line and polygon geometries; and the various RSS encodings. [GML, Simple]

rome: RSS and Atom utilities for Java
https://java.net/projects/rome/pages/Home

ROME is an open source (Apache license) set of Atom/RSS Java utilities that make it easy to work in Java with most syndication formats.

Feeds (from oldest to newest)

GeoNames recent changes
http://www.geonames.org/recent-changes.xml

Geonames provides free geo-data such as geographical names and postal codes. The database contains over 6 million entries for geographical names whereof 2.2 million cities and villages. In addition to the raw feed, there's also a worldKit map. [Simple]

Geograph British Isles
http://www.geograph.org.uk/syndicator.php?format=GeoRSS

The Geograph British Isles project aims to collect a geographically representative photograph for every square kilometre of the British Isles. [Simple]

Policy

INSPIRE
http://inspire.jrc.ec.europa.eu

GeoRSS is a normative reference for Technical Guidance for the Implementation of INSPIRE Download Services for Atom data set feeds.

Canadian Geospatial Data Infrastructure (CGDI)
http://geoconnections.nrcan.gc.ca/

Canada identifies GeoRSS as a standard.