The Pusher protocol is a websockets based event/messaging service. PushPlay uses the same exact javascript library that pusher uses, only with different connection parameters.
This may look familiar, a few days ago Stevie Graham posted about Slanger, http://news.ycombinator.com/item?id=3359097 which is has the same aim, but for different platforms. (You can see my excitement when I stumbled on his post considering the goals of our projects).
It is just a fun side project, and was made really easy thanks to the Play! framework architecture. Still some things to work out, but those should be fun problems as well.
Let me know what you think!