This is good stuff:

PDF:Identity Metasystem Design Rationale

There is a lot of info packed into these 11 pages – it is densely formatted, and there are no flowery sentiments. Terse is good. I like terse. I’d have to say that this paper represents pretty well everything I’ve ever heard Kim, John, Andy, Bill, or Mike say about the metasystem… so I guess that makes them terse and consistent :-)