"It's a guy, pretty much as intelligent as, and at least twice as effective as a dozen Ph.D's in philosophy examining and discussing how to think better. Look, just... Here, The Simple Truth. Read this. It's basically this kind of thinking applied to everything."
Not that brief, but it's gotten at least a few interested in LW.
6Risto_Saarelma
"Computer programmers trying to do philosophy" is how I describe LW to myself, but I don't know how effective that'd be for outsiders.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.