Here I've written a related post on how I automated the delivery to Amazon S3: <a href="http://born2code.net/blog/2013/05/27/simplify-your-jekyll-publishing-process-with-wercker/" rel="nofollow">http://born2code.net/blog/2013/05/27/simplify-your-jekyll-pu...</a>
the wercker blog also has a post on how to set up a delivery pipeline with Middleman:<p><a href="http://blog.wercker.com/2013/06/10/Streamlining-Middleman-Deploys-to-s3.html" rel="nofollow">http://blog.wercker.com/2013/06/10/Streamlining-Middleman-De...</a>