"Speak It On My iPod® 2.0
Send Multiple Documents to Your iPod While You Sleep
WHAT IS IT?
It converts documents on your computer into audio files you can listen to on your iPod using the speech features of Mac OS X."
Costs $10 US
I used Kolibri while it was still in beta for the Proloquo2Go video tutorials. Kolibri is great for adding captions to videos for the deaf and hard of hearing population. The software is now available in the Mac App Store.