feed.rss is a snapshot of

  http://software-carpentry.disqus.com/latest.rss

as of 2012-12-10.

HTTP headers:

  HTTP/1.1 200 OK
  Date: Mon, 10 Dec 2012 23:08:27 GMT
  Server: Apache
  Vary: Cookie,Accept-Encoding
  p3p: CP="DSP IDC CUR ADM DELi STP NAV COM UNI INT PHY DEM"
  Connection: close
  Transfer-Encoding: chunked
  Content-Type: application/xml
