Early this year I played around with the open source code on the Wave protocol site, but "play" is the active word here: I did nothing practical with it.

Although I never used Wave's web UI very much, I did find writing Wave robots interesting and potentially very useful. I invested a fair amount of time in learning the technology. I was disappointed when Google recently announced their phasing out support of Wave but today's announcement that they are completing the open source project to the point of its being a complete system is very good news.