Huffduffer

According to this tweet from Austin, huffDuffer solves the request for "Instapaper for MP3s." The name is a bit odd and the site is a bit strangely laid out but the concept is great.

1. Find links to audio files on the Web.
2. Huffduff the links - add them to your podcast.

Pretty simple but seems like a whole lot of potential for making it easy to catch up with a backlog of audio at your leisure.

Side note, love this sign up form.