I rather liked this official US 'call-to-arms' from the 1950's to recruit new librarians. It is fairly long, at just over 10 minutes, but its a bit of a gem. Although its very dated, there are some things that still ring true for libraries and librarians today. I especially liked the query at the start, 'are books your friends'? I guess in the context of today's libraries and the 23 Things, we're more likely to ask 'is [Google]* your friend?'
*Insert name of Web2.0 technology here