This is great, really really like the sticky feature of weekly/monthly/yearly digests.<p>I get most of my book recs from HN comments. Usually they are non-technical, anything from Michael Mauboussin to the Secret Life of Groceries. I would appreciate a simple "coreHN / not-coreHN" switch. (CoreHN would be books about startups, technologies, etc. I prefer the diverse topics, which are often buried in HN).<p>Also curious - are you parsing comments to identify books, or just submissions?