Agree, Server Sent Events is an incredibly simple API, has none of the problems with proxies, security and complexity that websockets has run into and is perfect for the typical case where Ajax is fine for sending events to the server, but you need a way to stream events in the other direction.

I just launched the beta of a small service for making Server Sent Events painless at http://eventsourcehq.com

It's currently only available for members of Heroku's beta program, but I plan on launching it as a stand alone service as well. In any case all the code behind it available on Github...