Google continues to push Google+ Hangouts capabilities to many of their products, and the latest integration is with Google Calendar. Now, you can add a Hangout to any event on your calendar and access it with a single click.
From the Gmail blog:
Do you use Google Calendar to schedule catch ups with distant friends and family? Now, if you've upgraded to Google+, you can schedule a face-to-face video chat right from Google Calendar using Google+ Hangouts. It takes one click to add a hangout to an event and another click to join the hangout.
Last month, Google integrated Hangouts into Gmail. Google said that this would increase reliability and quality of video chats, since it replaces the old peer-to-peer technology.
And earlier this month, Google began testing an experimental feature which allows users to send private messages to other users inside Hangouts.