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For example, consider:
'The use of italics [in comics] is quite varied: Italic dialogue is used for internal monologues, traditional-style locator & time captions, narrative captions, in thought balloons or for any instance where a voice is being transmitted through a TV, radio, communicator, as in a radio balloon. Rarely, you'll see italics used for non-verbal words like "Uh," or "Huh", or in conjunction with someone who is whispering. Italics are also used for non-English words and the titles of movies, books, etc.'
Cheers for that, Nate!
(via Forbidden Planet)