ruby Push Engine

1.The github repository :https://github.com/maccman/juggernautExample of application with juggernaut :https://github.com/maccman/holla

2.

Check out Faye:http://faye.jcoglan.com/- I hear really good things about it.

if you're looking for a hosted solution, i've used Pusherhttp://pusher.com/in the past, and loved it. i converted a site that used ajax polling over to pusher in about 30 minutes.

3.ajax engine