I can highly recommend SIPS (Spirits Institute Puget Sound, www.sipsclass.org) which is in Seattle.
I attended the last SIPS class (#13) and it was extremely valuable. I came to the class with quite a bit of distilling knowledge and this class helped fill in all the gaps (especially at the commercial/production level). Spending a whole day learning from an ex-TTB agent was by far the most valuable piece of the class for me.
Feel free to PM me if you want to know more specifics about my experience with this class.
Patrick
Northwest Rum Company