Google Wave

Google Wave is an online tool for real-time communication and collaboration. A wave can be both a conversation
and a document where people can discuss and work together using richly formatted text, photos, videos, maps, and more.

A wave is equal parts conversation and document. People can communicate and work together with richly formatted text, photos, videos, maps, and more.

Real-time collaboration	Natural language tools	Extending Google Wave
Concurrency control technology lets all people on a wave edit rich media at the same time. Watch the tech video	Server-based models provide contextual suggestions and spelling correction. Watch the tech video	Embed waves in other sites or add live social gadgets, thanks to Google Wave APIs.