is a cool new web service for anyone dealing with audio. You really have to sign up and play around with it to get a feel for what it is! As well as being able to upload large audio files and share them, you can attach comments to the wave form. Hopefully it will embed here, if not, try looking at it on the soundcloud website
Roll your cursor over the little avatars under the waveform to see comments, attached to specific points in the music.