The Integrated Earth Data Applications are accessible through a variety of APIs and clients, including REST, SOAP, an Open Geospacial Consortium, and an "Open Archive Initiative Protocol for Metadata Harvest." These can be used to create maps, visualize data, plot sample positions and create customized data compilations. Funded by the US National Science Foundation (NSF), the IEDA provides "data services for observational solid earth data from the Ocean, Earth, and Polar Sciences" to support the work of the geosciences community.
Today at Where 2.0 Yahoo announced the release of Placemaker, a new "geo-enrichment" platform. The freely-available platform, which includes an API (our Placemaker API Profile), enables developers and publishers to make applications and data sets location-aware by determining the "whereness" of unstructured content (such as blog posts, new articles, feeds, and web pages).