I'm not familiar with using third-party dictionaries on the Kindle 3, at least not as the lookup dictionary for when reading a book. I do know that many of the eBook reading apps for iOS (iPad/iPhone) and Android have lookup dictionaries with a button you can press to hear the word pronounced. But I know of no eInk reader with this native ability.
BTW, The Kindle 3 dictionary does have pronunciation symbols if you expand the small lookup window to fullscreen, but it will not sound out the word AFAIK.
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