If you have not heard about Google Wave, this is something that you need to pay attention to. It is a communication tool that merges email, IM, documentation and social networking into one nice integrated tool. The demo was very convincing and really comes off as a nice shared communications tool that will help to increase collaboration.
Although the setup and configurations have not been revealed, it is built on HTML 5 which will not run on some browsers, however, if this starts to take off, you will see a move toward HTML5 in all browsers. This is a tool that has great promise both behind and in front of the firewall, however, I am curious how the Federation authorization will work.
Here is a link to the Google Wave Blog and Dion Hinchcliffe wrote a nice overview of the “Enterprise Implications of Google Wave” which is worth reading.