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Have you ever needed to insert a special character while typing a document in Mac OS X, but didn’t know how? Apple doesn’t provide an easily accessible way to view which keys generate which characters. Buried in System Preferences though, is a keyboard viewer which will let you figure out which keys give which symbols. This video will show you how to enable this function and use it to discover helpful key combinations.
http://www.youtube.com/watch?v=OyzqbRF6fYU&feature=player_embedded#at=55 (http://www.youtube.com/watch?v=OyzqbRF6fYU&feature=player_embedded#at=55)