Via Casa Valdez, I found a full online course in jazz arranging from noted composer, arranger, bassist, and educator Chuck Israels. I didn't recognize the name, so I looked him up. Wikipedia says he's the Director of Jazz Studies at my siblings' alma mater, WWU.
This course looks pretty awesome. And since my perpetually expanding study list is never big enough, I'll throw this in as well. I require more hours in the day.