As many people have noted, Less Wrong currently isn't receiving as much content as we would like. One way to think about expanding the content is to think about which areas of study deserve more articles written on them.
For example, I expect that sociology has a lot to say about many of our cultural assumptions. It is quite possible that 95% of it is either obvious or junk, but almost all fields have that 5% within them that could be valuable. Another area of study that might be interesting to consider is anthropology. Again this is a field that allows us to step outside of our cultural assumptions.
I don't know anything about media studies, but I imagine that they have some worthwhile things to say about how we the information that we hear is distorted.
What other fields would you like to see some discussion of on Less Wrong?
I think the explicit goal should be to develop discussion strategies that kill the mindkiller i.e. put people into less tribal and more open minded moods. A good one is "what are people you dislike right about and people you like wrong about?" If you say "I dislike global warming skeptics but they seem to be right in certain things", you are killing the mind-killer, because you are putting people out of the "I like you and your ideas, therefore I think you are right" mood. So one tribe will think "cool, this person thinks we are right" and the other "cool, this person dislikes the same people we do" and all pay attention.