I am not sure how this is not already mentioned here, but here you go.
From this site http://starwars.wikia.com/wiki/Ziro_Desilijic_Tiure
"Ziro was originally going to speak Huttese into a microphone which would translate his speech into English, but this idea was dropped because the producers felt that younger audiences wouldn't be able to understand what the translator was. Later, George Lucas stepped in and specifically asked for Ziro to sound like Truman Capote. The character was a favorite of the production team, and they planned to have him return in the TV series."