Conscientiousness sounds like it might be a good topic.
A new citation I've worked in, the Terman study (only very intelligent children were used) discussed in http://infoproc.blogspot.com/2011/04/earnings-effects-of-personality.html - eyeballing it, going from 10th to 90th in Conscientiousness was worth $800,000 over a lifetime. More than a similar jump in IQ.
Very interesting. I am especially interested in this because I have recently acquired some artificial conscientiousness via habitual use of task lists.
The last prize, for the best literature review of spaced repetition, was moderately successful, inspiring a pretty good review of the academic literature on spaced repetition. I am interested in experimenting more with prizes, but I would like to get input other people's input: what are other good topics for future prizes?
The topic should be: