Google announced Google Wave this week. Its goal is to completely replace email as we know it with something much better. In this video you get a complete description of the product and its goals. But if you just want to see the demo it starts at 7:30.
– Google Wave: A Complete Guide
– Google Wave: What Might Email Look Like If It Were Invented Today?
– A Sneak Peak at Google Wave
– Google Waves Goodbye to E-Mail, Welcomes Real-Time Communication