Introducing Typesafe Console
blog.typesafe.com
blog.typesafe.com
The front end is all CoffeeScript and Canvas and uses Server-Sent Events (falling back to comet) to talk to the server.
One the server-side we're making heavy use of Play 2.0's Iteratees https://github.com/playframework/Play20/wiki/Iteratees to control the data streams.