All indications are that audio books are becoming more popular than ebooks. This means that we ebook authors probably need to be thinking about getting our collection into audio format as well. New audio book sellers are popping up all over the place and sales of iPods and other MP3 readers are trending upwards daily. (Even my wife and I have iPods!).
Take a look at the quality range of audio books available at sites like http://www.audible.com
and newcomer http://www.download-audios.com
and you'll see why it's time for us to convert from PDF to audio.
This of course presents new service opportunities for entrepreneurs too, however, I understand that there is software that will automatically convert text to audio without any need for human intervention other than to operate the software. What will they think of next?