DocType seems to be a little different than the rest of the Stack Exchange sites, old and new. There are various references to a 'Litmus', but it's not quite clear what the relationship is between the Stack Exchange network and DocType.
From the DocType FAQ:
Who built Doctype?
Doctype was built by the people who run Litmus...
Does this mean that these 'Litmus' people are running a franchise of sorts for the stack exchange system?
Or is DocType wholly owned and run by Stack Overflow Internet Services Inc.?