Unfortunately, you can only use the audio produced at that site for private purposes only.
http://www.research.att.com/projects/tts/faq.html#WebPolicy
Here's what a google search turned up:
http://www.spacejock.com/yRead.html
I downloaded it and it sounds alright, though nowhere near as good as the link SkyCubes gave you. If you do a goole search for free text to speech programs you are bound to find a ton, I did. I have some experience with Read Please, but don't know what the terms are on that one.
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Light a man a fire and he'll be warm for a day.
Set a man on fire and he'll be warm for the rest of his life.