There are many interesting features in google+ but hangout trumps them all. Today, at 12:45, the Catlin Seaview Survey scheduled a hangout for all who were interested in reefs and underwater photography at 3:45pm (Sydney time - 3 hours ahead of me) at the Great Barrier Reef with a diver communicating with us from underwater all done live through hangout. The half-hour live video conferencing was great. It was almost like I was diving at the Great Barrier Reef myself. I screen-saved quite a bit. Here's a sample.