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?
The missing topics are labeled Taboo. I believe the Less Wrong community could contribute quite a bit to each of these but they are just too painful. I wish there was a way to discuss aspects of them without falling into the tired ruts. I am convinced that some LWers have gone down these paths and returned or discovered something insightful. But the current Taboos on it makes it difficult to broach these topics. Also there are trolls for many of them...