Hm. We are principally interested here, practicality-wise, in akrasia and productivity. I don't know of any particular area of the akrasia literature that hasn't been discussed thoroughly here. Productivity-wise, software tools outside psychological training like dual n-back and spaced repetition tools like Mnemosyne/Anki already have their coverage. Nootropics are a common interest, but the major ones seem covered either by Wikipedia or my own stuff.

Maybe there's an area of psychology missing? For example, I've wondered how well-researched the Big Five personality factors are, and in particular, what the research on Conscientiousness says. I've collected a number of citations on it, but this has always been half-hearted. Which is too bad, because Conscientiousness seems like a major factor that LWers lack, and is pretty closely related to akrasia. Lukeprog claimed there was research into how to improve it in one of the reviews he cited, but I couldn't refind it.