Google Launches OpenSocial

• Google launched the OpenSocial — a set of common APIs for building social applications across the web — for developers of social applications and websites that want to add social features. OpenSocial will unleash more powerful and pervasive social capabilities for the web, empowering developers to build far-reaching applications that users can enjoy regardless of the websites, web applications, or social networks they use. The release of OpenSocial marks the first time that multiple social networks have been made accessible under a common API to make development and distribution easier and more efficient for developers.
  Full Article: Google Launches OpenSocial
• Google OpenSocial API DOCS
• Building your first gadget for Orkut
  First Orkut Gadget
• Creating First Hello World Gadget