Catching up on blog reading, I discovered Matt Webb's day-by-day feed of the Notebooks of Leonardo Da Vinci. Besides the actual feed itself, which I've now subscribed to, Matt nicely solves the problem of how to provide an RSS-based day-by-day reading plan that allows the reader to start at any time.
Rather that a single feed, it appears Matt offers a new feed each day. If you start the reading plan on the 4th of June, for example, you use the feed at http://interconnected.org/home/more/davinci/2004-06-04.rss whereas people starting in a week's time will presumably use a feed at http://interconnected.org/home/more/davinci/2004-06-11.rss
The main page provides a dynamically generated link to the feed to use if you're starting today.
It's a very simple idea but a great way of implementing a reading plan. I'll probably implement it in my own Leonardo.