Google released the Google Base Data API, that allows client applications to view and update stored data in the form of Google data API ("GData") feeds. Your client application can use the Google Base data API to create new data, edit or delete existing data, and query for data items that match particular criteria. You can also query for items with specific attributes. The API is REST-based (you’ll be accessing Atom XMLs through parametrized URLs.)

More info: Google Base Data API

Source:→ Google Blogoscoped