I've been reading two papers lately related to Black-Litterman and one that isn't. Mark Kritzman's paper on asset allocation in turbulent regimes is pretty interesting, I'm working on some code to try it out. On the Black-Litterman front, I've been checking out The Augmented Black-Litterman Model which covers a new way to integrate factor models with Black-Litterman. I've plans to write a paper comparing some results from a factor model for tactical asset allocation using Wing Cheung's methods and also the more straight forward two-step approach.
Finally I also came across A VaR Black-Litterman Model which is an interesting paper as well. The author goes into some depth of the implementation of their optimization algorithms which intrigues me as they cover a pretty complex problem with integer and linear constraints.