My friend David Niemeijer has been working on some new synthetic voices and they’re quite amazing: British Children’s Voices. Play the New Harry voice and the new Rosie voice, you’ll be impressed.
Text to speech or synthetic speech has really come a long way. These voices are as good or better than Siri which is state of the art for text to speech.
David is the developer behind AssistiveWare which makes assistive technology products for the Macintosh, iPad, and iPhone for people with a variety of special access needs. These new voices are built into various products.