From the same team that made Google Maps we have Google Wave. It's a complete re-invention of email and instant messaging. Details are cloudy at the moment, but here is the pitch:
That is exactly the right question, and one that every developer should be asking him or herself. The world of computing has changed, profoundly, yet so many of our applications bear the burden of decades of old thinking. We need to challenge our assumptions and re-imagine the tools we take for granted. It's perhaps no accident that this project, carried out secretly at Google's Sydney office over the past two years, had the code name Walkabout. That's the Australian aboriginal tradition of going off for an extended period to retrace the songlines and learn the world anew.
In answering the question, Jens, Lars, and team re-imagined email and instant-messaging in a connected world, a world in which messages no longer need to be sent from one place to another, but could become a conversation in the cloud. Effectively, a message (a wave) is a shared communications space with elements drawn from email, instant messaging, social networking, and even wikis.