Skype call it "ambient video"

The basic concept of the Teletalker i.e. providing a constant online window into the other space is not new, although the means to activate the volume is. On Skype's blog they call it "ambient video". Skype refers back how they have their offices around the world connected in this way, but interestingly the skype computer is not near the work place, but in the break out area near the water cooler - a place that invites for a chat. read full skype blog here