I find it interesting how a "trust rating" would affect traditional media outlets, all of whom now publish scores of content online. A rating system wouldn't just discredit LHC doomsday sites, but could potentially be a positive source of pressure for TV news, newspapers, and magazines as well.
Anyway, I agree Duncan is being a spaz and that TBL's idea isn't completely absurd. I imagine something like a Firefox plugin for factcheck.org.