Using your iPod as a productivity tool

I was checking out inFlightHQ.com recently and happened to come across the following:

I consider my iPod to be one of my most valuable productivity tools (particularly when flying.) Thanks to programs that can convert text files into spoken audio (and automatically implant these audio files into iTunes), I can get through tons of reading during normal "dead times".

Now, I use my iPod to listen to a lot of podcasts while I'm on the move but the above was something I haven't tried. If you've given this a go we'd love to hear from you...drop us a line in the forums.