I would like to know what the plans currently are regarding the release of an edge-side include module (ESI, http://en.wikipedia.org/wiki/Edge_Side_Includes) for Nginx, as currently the solution is to throw another ESI-capable webserver in the mix (e.g. Varnish, http://jimmyg.org/blog/2009/ssi-memcached-nginx.html) which adds complexity and overhead to the solution.

Is an ESI module ever going to make it to Nginx? If so, when?

Having ESI capability built in Nginx would just be fantastic as we could serve combined page fragments from memcache thus leveraging caching for authenticated users.