You can use TTS bundled with windows XP (Although vista is better) or your MacOS..
Or just use one of the online demos:
http://www.research.att.com/~ttsweb/tts/demo.php
You'll need to use some freeware program to convert your samples to mp3 though..
I'll bundle the release with just English samples - but I'm sure people would convert them to other languages if the need to...