I'm a fairly new LW user, as evidenced by my so-far low karma. However, I've previously been familiar with a lot of the ideas talked about here and I've been reading the site for a few weeks. I think that the material here is amazing and often unparalleled on the rest of the web.
However, there's is one...weak point: the wiki. The sequences are a little bit formidable to beginners because of the massive tangle of hyperlinks which connect them together. When I started reading them, I routinely had 10-15 LW tabs open at once. My friends said a similar thing. Thus, I think that it would be helpful to have a reliable source of information where the recursion can sort of "bottom out," if you know what I mean. That should be the wiki.
But it's in a pretty sorry state right now. A lot of the articles are titles-only, a couple sentences long, or just a bunch of links which invariably lead to more links. Maybe I'm blowing this out of proportion, but I think that the wiki is something that could definitely be brought up to par with the (high) quality of the site.
So maybe several members should choose something they know about (or perhaps don't) and then research and write a good entry on it.