Sometimes they come back...
I'm a sucker for Jaynes, and I still think that Ap distributions are a much more solid contribution to the subject than any philosophical discussion of Knightian uncertainty or partition of the data, especially when you interpret Ap to be "the probability of retrieving a piece of evidence that will set P(A) = p".
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.