I was looking for something to make a voicemail greeting since my recorded voice is nasty. This one gave me a big wow:
AT&T Labs Text-to-Speech: Demo

Does anyone use a text to speech synthesizer that you like?

That's the one I've been playing with for years, since about 2002. It has come a long way.

I'm bummed that they only allow 30 words. It's the best sounding one I've ever heard!

Make multiple files and edit them together with Audacity.

Hey, cool. I'll check it out. Here's a software app that uses the same engine voices... but one voice for $40 is a bit pricey in my book.:
Text to speech software with Natural Voices-- Free NaturalReader