Speak is a quick little utility I threw together from old BSD code, and utilizes MacOS X’s underlying speech engine.
It’s a command line utility, which is odd for all but the most geeky of Mac users – mimmicing cat, mincing the data given to it, and rather than displaying it on the terminal, it will speak it through your Mac’s speakers, as demonstrated in this MP3.
Enough of the banter, I’m sure you want to get to speaking your text files.