Skobbler uses the free editable OpenStreetMap to create apps such as GPS Navigation 2, and ForeverMap that provides maps offline that work when you can't be online. The company has just released the Skobbler tiles API. Compatible with popular frameworks like Leaflet, OpenLayers and Google Maps API v3, its API allows you access to its tile server and to embed maps in your applications.
The latest release of desktop Twitter app TweetDeck launched with a ton of new features, which includes showing geolocated tweets. If a tweet includes the location meta-data, TweetDeck shows a tiny marker icon. Click the icon and you get a map of the location.