Thanks there are some good ones there.

If it's not strictly related but likely of interest to the same people that are interested in rationality (e.g. credible self-improvement) then it's better if posts aren't that frequently. For instance, there's a lot of good stuff in hacker news but there's 100+ front-page posts per day and it would drown everything else out.

If the aggregator proves popular I could introduce a text-classification filter to try to only include relevant posts from sources with varied content, but I'm only willing to invest time in that if it turns out that people are responsive to the aggregator in its current simpler form.