Understanding that core.async is new and evolving, but is there a reference or an idiomatic way to work with blocking operations, beyond the general advice of separate threads as an exercise for the reader?

EDIT: I bring this up because this seems like a common misstep for users of core.async, and a simple pattern for blocking IO might help people avoid it.

core.async really looks awesome...if we can create simple patterns for working with blocking operations, it would be a compelling model for a lot of use cases.

(Also, hats off to the core.async developers; it seems like the reward for creating something great is just demand for more. ;)