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