All the nitty gritty details when the big picture has settled.
modules/index actions/index controllers/index dispatch/index filters/index models/index services/index tags/index scomps/index validators/index
There are reference docs built from the source code using edoc, and may be browsed online at: http://zotonic.com/edoc/core for the core docs, and http://zotonic.com/edoc/modules for the module docs.