Personally I'm thinking of building a minimalist overlay that can be put on top of github and all the other content management websites. Then you can benefit from the help/interest from the normal community as well as the rationalist specific one.

The things is, content management websites tend to be agnostic to the purposefulness of the code/designs/words they host. So you get good feedback for doing things like making a laser cuttable settlers of catan board (yep I did this). So I would like to be able to take a lesswrongian attitude of evaluating whether this is the best use of my time to wherever I happen to be putting lots of effort* into making things on the web.

The closest thing is hackernews but that has a mercantile bent that is not suitable to all projects.

*Some stuff I make will be for the warm fuzzies, but other stuff should be hard nosed rationalist stuff.