I finally figured out how to make a recipe for a news feed in Calibre. Now every evening it automatically downloads the stories from the last 24 hours and formats them for my Nook so I can take Fictionaut to bed with me. :) Much more comfortable to read (especially longer stuff) on the eink screen.
Bonus: no messing around with individual PDFs; Calibre automatically cleans up the old downloads. Down side: can't immediately comment; no author note.