'The Century of the Self'

A superb four-part documentary on the history of propaganda.

"This series is about how those in power have used Freud's theories to try and control the dangerous crowd in an age of mass democracy." - Adam Curtis, writer and producer of the series.

Available to view on Google Video (you'll have to download the Google Video player, but it's worth it):
Part one
Part two
Part three
Part four

More Adam Curtis documentaries:
The Mayfair Set (This site, theDossier, is a major resource for video and audio documentaries)
The Power of Nightmares

A biography and interview with Adam Curtis

Adam Curtis used his BAFTA speech last year to criticise the media's sensationalisation of the supposed ricin terrorists.
The Guardian story
Prison Planet's view
The ricin case timeline