In 1997, the BBC aired a three-hour documentary based on Stewart Brand's book, How Buildings Learn. Brand has posted the whole program on Google Video in six 30-minute parts: part one, part two, part three, part four, part five, part six.
If you're hesitant about whether to watch the series or not, check out this two-minute appetizer of perhaps the meatiest tidbit in the book: the oak beam replacement plan for the dining hall of New College, Oxford. (via smashing telly)
Update: An old version of the New College web site says that the oaks were not planted specifically for the replacement of the ceiling beams even though they were used for that purpose. (thx, emily, david, and phil)