Yahoo! released a new web service, “Yahoo! Placemaker,” a geo-enrichment tool for the web contents. Developers can geo-enrich their content, such as web pages, blog posts, feeds, news articles, status updates, and their applications which make use of such information. Placemaker is an open API; it helps developers to make applications and data sets location aware. Placemaker is not a geocoder, it is a geo-enrichment service that assists in determining the whereness of unstructured content and helps make the Internet increasingly hyper local.
More info: Yahoo! Geo Blog