Etherpad to remain active until code is open sourced
Google bought this lovely web based multiplayer notepad the other day, with an initial plan to shut the whole thing down, but people complained. If you need to work on text or code with other people, try Etherpad, it really is Fully Qualified Awesome.
The AppJet framework, on which Etherpad is based, is probably something Google needs for allowing third parties to develop on the Wave platform. The framework is Java based, which in other words means that self-hosting a future open version might be a bit trickier than setting up WordPress on your typical ten dollar web host.