Students can be provided MP3 files of class notes, study guides, review materials, or any other textual material which they can then listen to on their iPods or other MP3 players.
Text-to-Speech technology is improving constantly. The old monotone, mechanical speech patterns have been replaced by spoken content that sometimes sounds nearly natural.
I've provided links to a number of online text-to-speech services. Some are quite good, ReadTheWords and YAKiToMe! are my first choices. Some are free, some charge a fee, and others have both limited free and paid plans which offer more. Most will allow you to embed a player into your own blog, wiki, or web page or direct link to their site.
Visit each and find the one which best suits your needs.
Here's an example of this post read by Tom from ReadTheWords ...
Here's an example of this post read by Audrey from YAKiToMe!...