Semiology
There's a neat film on different kinds of signs here on YouTube. You can hear a lecture on Saussurian semiotics by Professor Paul H. Fry from Yale University on iTunesU: click here for the video and here for the audio.
The Sound of Ideas has an audio on changes in advertising from the 1960s to now: http://www.ideastream.org/soi/entry/29610.
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