Agree. NancyLebovitz's posts points at something true: there should be more resources like HPMOR for "regular people" to increase their level of rationality. That's part of the reason I'm excited about groups like Intentional Insights that are working on this. But I think "dumbing down" Less Wrong is a mistake. You want to segment your audience. Less Wrong is for the segment that gets curious when they see unfamiliar technical terms.
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."