IRC Conversation on User, User Agent, Media Types, Application etc.

Currently I am trying to figure out the significance of the various aspects of a RESTful architecture with regard to modeling. Such aspects as user agent, media type, steady state, user, application, and application state. Tried to build-up an explanatory train of thought on that basis in an exchange with Philipp Meier on #rest IRC yesterday. It is the typical, hard to read, IRC conversation but you might find it useful nevertheless.