Flickr has added more real-time goodness to their photo API. Using a publish / subscribe (PubSub) system, developers can now receive real-time updates across millions of photos across Flickr friends, Flickr Commons, and by tags and geo-location using the Flickr Real-Time API.
ForWhereIAm is a service that offers real-time, short-lived and localised information. Businesses use it as a place to post information they want to share with their customers, and users can visit the site to get information on deals and announcements that are relevant to their specific location. The ForWhereIAm API makes some of this data available to third-party developers.