Today i have received an invitation to Google wave. And just had a small walk through through the features of Google wave, it is really great. It will be a hreat support in the working environment too i think.
You can share photos, videos, documents etc. You can tweet from the Google wave. more than one user can edit documents at the same time etc.
Just check the below video for more details
And if you have enough time you can watch the following 80 min video too