Note that the International Film & Video Workshops have a couple of documentary-specific classes, such as "Documentary Camera," and "The Interview." I took "Camera Assistant" there last summer, and found it to be pretty good. However, the whole place is under new management, so I think the quality of classes may be a bit uneven these days.
Not to hijack your thread - but does anyone out there know of similar programs in the U.S.? That is, short, intensive workshops with experienced working professionals as instructors? Specifically, I'm interested in cinematography.