There's been a lot of talk about Google Wave. It is a a real-time communication and collaboration system. It's open source and also a protocol.
Google have been trying to figure out "what would email look like if it was invented today"- this is what they've come up with. To me it looks like a live transmission hybrid email instant messenger all rolled into one
This is a long video so set some time aside for an hour before you check this out. When you go to 7 minutes, 30 seconds you start to get an idea of what the UI looks like.
As I mentioned in the Irish Recruiters conference Unified Communications is definitely going to be one of the main technological trends in FY10. Google Wave falls clearly into this category. Will be very interesting to see how the platform develops when it launches later this year.