Brett's archives were purchased from his daughter by a foundation. They oversee licensing or use of his images, donate his work to museums, help writers or institutions that are researching Brett's work, etc... That's the Brett Weston Archive referred to in the previous post. The DVD in question is simply awesome - the best portrait done of a working photographer that I've ever seen.
Don't know why so many BW fans are on APUG - never noticed, actually. However, he has certainly been the biggest influence on my own work. Unfortunately, too many people seem to dismiss him as only Edward's son when he was really his contemporary and a strong influence on his father (as EW says himself in the Daybooks). IMO not enough has been written about Brett. He wrote so very little about himself, preferring to let his photographs speak for themsleves. Somebody was working on a BW biography which I'd love to see published someday.