It might be useful to give more examples of how cognitive biases can be used to improve their thinking

Got any specific ideas? (I already fished once, see http://lesswrong.com/lw/bfr/rationality_anecdotes_for_the_homepage/.)

I like the example CFAR uses on their "What is rationality?" page, though it's a bit long as is.

The section "Reading an Study" has a lot of stuff in it- it may be worth putting something in, either at the start or by appending a question about whether or not all this material is necessary, that states that you don't necessarily need to read all of it in order to participate.

How's this?

Looks great!

(I don't, at present, have anything constructive to say about "meaty" synonyms or foundational ideas, sorry.)