Personally, I don't care about the WSGI level - I'd rather examine the higher-level concepts which applications use directly to behave in the ways that they do.
That's what my talk at PyCon was about, and I want to re-express all those same ideas here as articles. WSGIKit is an architecture that uses WSGI as the way to pull together those higher-level concepts -- it's using WSGI as much more than a generic way to connect to a server. If all WSGI did was connect apps to server, it would be useful but indeed quite boring -- but WSGI is really a sneaky way of creating a standard request and response object, and a pattern for providing a stack of filters. And that is a big deal, even if it isn't an end in itself.