My b2evolution Version: Not Entered
I saw and heard a demo of Odiogo and man - it is pretty sweet. It basically reads your text and you can create a podcast from the audio.
See Demo here:
http://clear.bluedei.com/2007/08/11/web-20-convert-your-post-texts-to-speech-with-odiogo
This would be a really cool plugin.
If it works in spanish, I'l think about it :)