Jon Udell has posted a fascinating essay disecting two different but often confused usage models for RSS and other content feeds. Jon refers to the duality of his experience at SpokenWord.org. One one hand he follows feeds or others’ collections prospectively looking for good programs that may appear in the future. In the other use case, he also searches the SpokenWord.org archives for already-published programs. Both cases make use of SpokenWord.org’s collections and RSS feeds, but in different ways.