Chromium Blog: Connecting Web Apps with Web Intents

Chromium Blog: Connecting Web Apps with Web Intents: In today’s browser ecosystem, web apps are completely disconnected or require the use of complicated APIs in order to make use of a third-party service, e.g., posting a comment to Twitter from your custom publishing domain. What if we could give sites the ability to leverage these services without any knowledge of the chosen service, except that it provides some set of predefined functionality?....

(by James Hawkins, Software Engineer)

The effort is coordinated with Mozilla. Examples can be found here. There is a Javascript port for browsers which do not yet support this functionality (which is pretty much all current Browsers)