The Heroku gem itself can do this for you - if you put in a before or after_filter a quick check on HTTP_X_HEROKU_QUEUE_DEPTH or HTTP_X_HEROKU_QUEUE_WAIT_TIME depending on your criteria, then use the gem to add or remove a dyno as suits you. Look at http://blog.darkhax.com/2010/07/30/auto-scale-your-resque-workers-on-heroku for inspiration on how to do it.
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