Here's a neat little procedural case. That concerns those somewhat unique situations in which, as here, the district court may properly order a defendant to pay for the initial costs of notifying the class members; for example, when (again, as here) the district court has already determined liability prior to certification.
It's also neat because it addresses "anticipatory mootness" -- a rare doctrine, but one that applies when various events (here, the fact that there's a certified question pending before the California Supreme Court) may result in obviating the need to address the issue on appeal. I agree with Judge Gould that this is clearly a prudential (non-Article III) impediment and that, especially in cases like this one, it makes sense to resolve the appeal.
So if you're a federal courts person and/or a procedure guru, here's a nice little case for your morning reading. Because you can never have too much knowledge.