PUBLIC MARKS with tags geolocation & "semantic web"

Provided with free-form text, the service identifies places mentioned in text, disambiguates those places, and returns unique identifiers (WOEIDs) for each, as well as information about how many times the place was found in the text, and where in the text it was found. Gorgeous!

"... So I now have a way of viewing my geotagged photos that fills the entire browser window with a map."

GeoRSS is a simple proposal for geo-enabling, or tagging, “really simple syndication” (RSS) feeds with location information. GeoRSS standardizes the way in which “where” is encoded with enough simplicity and descriptive power to satisfy most needs to describe the location of Web content. It is extensible and upwardly-compatible with more sophisticated formats like the OGC GML (Geography Markup Language®).

Geographically Encoded Objects for RSS feeds

On the cross-fertilization of geospatial and semantic web technology