I prepped for my first class in our stats for grad students series by making up some notation for leave-one-out cross-validation, for which I am going to advocate in situations where you need to make a decision and you don't have any serious thoughts about your utility. It surprises many that I am against using marginalized likelihood (Bayes evidence). But I am against it because that is what you would compute in order to mix models, not to decide between them! Also, it is strongly dependent on your priors, when anything you want to use for deciding should be strongly dependent on your utility. And it is super-hard to compute in most circumstances. And so on.
David Russell (Canarias) gave a seminar today on the relationships between microquasars and quasars, and what those things might tell us about how jets are powered. He showed some outrageous phenomenology, including beautiful jet–plasma interactions and a
fundamental plane of accreting (hard state) black holes.