Steps

1. Convert the audio file from AUP to WAV or MP3 (using Audacity/Lame/WinLame)

2. Transcribe from WAV or MP3 to Text (using WAV-To-TEXT Voice Recognition)

This looks like a new breed of webcasting opportunities:  

http://www.programmableweb.com/

Audio Mashups http://www.programmableweb.com/mashups/directory/1?q=audio

Video Mashups http://www.programmableweb.com/mashups/directory/1?q=video