Markr is an easy way to create bookmarks while listening to audio files. Perfect for quickly noting important parts of lectures, interviews and podcasts and then get back to what you were doing. No there is no need to interrupt your work out or to struggle with typing on a moving subway. Just make a Markr and review it at you later at you leisure.

You can even easily share you Markr notes through email.

http://appshopper.com/utilities/markr