Re-read Pearl, and read the Heckman-Pinto critique.I'm sure I'll blog on some of the above in due course. Meanwhile I want to add something to the list: Pearl's response to Heckman-Pinto. (I just learned of it.)
Re-read White et al. on settable systems and testing conditional independence.
Read Wolpin, and Rust's review.
Read Dawid 2007 and Dawid 2014.
Get and read Imbens-Rubin (available early 2015).
One of its themes resonates with me: Econometrics needs to examine more thoroughly the statistical causal modeling literature vis-à-vis standard econometric approaches. (The irreplaceable Hal White started building some magnificent bridges, but alas, he was taken from us much too soon.) Reasonable people will have sharply different views as to what's of value there, and the discussion is far from over, but I'm grateful to the likes of Pearl, White, Heckman, and Pinto for starting it.