I want to push data to the browser over HTTP without killing my django/python application.
I decided to use a comet server, to proxy requests between my application
If you can run Java I would recommend StreamHub Comet Server.
Firstly, regarding your need not to 'kill' your existing application, the JavaScript include has a really low footprint at less than 10K. I use it for pushing user updates and chat on the social networking site I'm building. I tested with a 1000+ hits a day and there was no noticeable effect on the CPU.
Secondly, on deploying, I followed some of the examples and was up and running really quickly compared to banging my head against a wall with CometD. There is a good Comet Hello World getting started guide and a Google Group if you get stuck on anything.