I'm not sure about webcomics or Youtube videos. LW is full of essays on abstract philosophical topics; if you don't like reading, you're probably not going to get much out of it. I think the biggest ways for people to help LW are:
Write quality posts. There are a bunch of suggestions in this FAQ question.
Share Less Wrong posts with thoughtful people who will find them interesting. Think Facebook friends, your favorite subreddit, etc. Ideally people who are even smarter than you are.
Improving the about page is also high-leverage. I encourage you to suggest concrete changes or simply ignore the existing one and write an alternative about page from scratch so we can take the best ideas from each.
Certainly, writing high quality posts is essential for improving on what we already do well, but as I mentioned in a reply above, not everyone learns best -- or at all effectively -- that way. To be clear, I'm not suggesting we do any less of that, but I think that we may be limiting ourselves somewhat by producing only that style of content. I think that we would be able to get more people interested in Less Wrong by producing non-textual content as well.
I will note, however, that when I suggested webcomics, I wasn't specifically intending a webcomic abo...
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