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Interesting post if anyone hasn't seen it yet: http://www.thesoftwaresimpleton.com/blog/2014/12/30/core-dot-async-dot-mouse-dot-down/
A nice, gentle into to transducers: http://gigasquidsoftware.com/blog/2014/09/06/green-eggs-and-transducers/
Good explanation of a transducer composition "gotcha": http://isaaccambron.com/blog/2014/12/13/transducer-composition.html