The slickest way I can imagine to do it would be be using HTML5 Webworkers on the clients and Websockets on NodeJS for the server. I've been thinking of doing

The slickest way I can imagine to do it would be be using HTML5 Webworkers on the clients and Websockets on NodeJS for the server. I've been thinking of doing some experiments in this direction, I'd be surprised if at least a few folks aren't already doing this.