I think LW's marketing should be optimized for very smart people with finely tuned bullshit detectors who may be relatively uneducated but are probably budding autodidacts.
That sounds like an excellent approach.
However it will make unhappy a bunch of people here who want to carry the torch of rationality into the masses and start raising waterlines :-/
I told an intelligent, well-educated friend about Less Wrong, so she googled, and got "Less Wrong is an online community for people who want to apply the discovery of biases like the conjunction fallacy, the affect heuristic, and scope insensitivity in order to fix their own thinking." and gave up immediately because she'd never heard of the biases.
While hers might not be the best possible attitude, I can't see that we win anything by driving people away with obscure language.
Possible improved introduction: "Less Wrong is a community for people who would like to think more clearly in order to improve their own and other people's lives, and to make major disasters less likely."