I've got a lot of MP3 and WAV files of talks and sermons that I am going to transcribe into text. These talks go many years back and hence the transcripts have been lost. There are hours and hours of talks and I'm looking for software that will help make my job easier. OS X comes with some very good text to speech capabilities. Is there any capability to do speech to text on OS X? It would be great if there were free/cheap shareware products that do this task. Any recommendations?