Also, I had expected that SI people monitored LW discussions, not just for critiques, but also for new ideas in general (like the decision theory results that cousin_it, Nesov, and others occasionally post).

I'm somewhat confident (from directly asking him a related question and also from many related observations over the last two years) that Eliezer mostly doesn't, or is very good at pretending that he doesn't. He's also not good at reading so even if he sees something he's only somewhat likely to understand it unless he already thinks it's worth it for him to go out of his way to understand it. If you want to influence Eliezer it's best to address him specifically and make sure to state your arguments clearly, and to explicitly disclaim that you're specifically not making any of the stupid arguments that your arguments could be pattern-matched to.

Also I know that Anna is often too busy to read LessWrong.