Google pulled the plug on Wave a few weeks ago. This is an unfortunate development for us as we found Wave to be quite useful. We have used it to successfully collaborate on a couple of projects as our designer lives a few hundred kilometres away from where we are. The ability to login at any time and view documents, graphics and other work; catch up on the dialogue and add to it was very useful.
You may have heard about Google Wave. It's a new technology being developed by Google. Google describes it as: