The categories of stuff on LW as I perceive them (in no particular order) are:
Philosophy
-Values and ethics (human, utilitarian, alien, or otherwise)
-Game Theory (subset of instrumental rationality)
-Epistemology (epistemic rationality)
Activism
-Effective Altruism (Givewell, 8000hours, meta charity)
-X-risk reduction
-investment in far future
Personal Development
-happiness-boosting
-Fighting Akrasia (procrastination, motivation, willpower)
-optimizing your organism (body, mind, nootropics, supplements,exercise, etc)
-good habits and heuristics (especially organization, decision making)
-tools and educational resources
-bias recognition and reduction
Self Referential
-about Lesswrong and associated blogosphere
-book reviews and views of various philosophers
-rationalist fiction, especially hpmor
Checking back, they line up well with yours.
However, as someone who is interested in all of these things, for me a more pressing problem is: how can we collate past content so that it will be easy to access now? There are a lot of great posts that aren't in the sequences, that I don't want to spend lots of time digging through and finding.
I think most people interested in one LW topic tend to be interested in others, so I'm not sure how much creating separate subreddits will improve anything.
Less Wrong is based on reddit code, which means we can create subreddits with relative ease.
Right now we have two subreddits, Main and Discussion. These are distinguished not by subject matter, but by whether a post is the type of thing that might be promoted to the front page or not (e.g. a meetup announcement, or a particularly well-composed and useful post).
As a result, almost everything is published to Discussion, and thus it is difficult for busy people to follow only the subjects they care about. More people will be able to engage if we split things into topic-specific subreddits, and make it easy to follow only what they care about.
To make it easier for people to follow only what they care about, we're building the code for a Dashboard thingie.
But we also need to figure out which subreddits to create, and we'd like community feedback about that.
We'll probably start small, with just 1-5 new subreddits.
Below are some initial ideas, to get the conversation started.
Idea 1
Idea 2