I just wrote a simple example project on how to implement event streaming (server-side events making use of HTML5's EventSource object).
You can find it at http://github.com/nh2/eventstreamexamples It is written for TG, but the controllers should be almost copy-and-pastable to Pylons. Be sure to use a browser that supports EventSource. I recommend the _latest_ Chromium dev as there was an annoying Webkit show stopper bug that has been fixed only some weeks ago (although there is a workaround that requires to patch TG).
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