Google Wave – wave.google.com
What is Google Wave?
Google Wave is a new communication and collaboration tool announced by Google.
1. It can be used like GMail, if more Google users are involved in the conversation, and the conversation has pictures, videos, links, etc, that could be better communicated through Google Wave.
2. It supports gadgets / Applications developed by users / third party (using Google Wave API)
3. These Gadgets/ apps (called as waves) can involve single/ multiple user interaction (like playing Chess, discussing about a photo album, etc).
Check these screenshots of Twitter Wave , Sudoku Wave
4. The Google Waves can be embedded in any website, to make your site colloborative.
Read more:
About Google Wave
Official Google Blog
Google Wave developer blog
For developers
Request Google Wave Sandbox access
Google Wave developer guide