summary of the evidence on Spaced Repetition
Would probably help to quantify that somewhat - as in "evidence that spaced repetition does X" (X being what you want to get from it).
With this framework evidence that SRS does not do X should also get the prize.
Putting it as "claims are made that SRS does X, here is the pro/con evidence" would also be a good format.
As I also consider this topic as very valuable I'll follow Joshua's suggestion and offer $20 to SIAI for this post.
EDIT: I am canceling this contest because I feel that the structure of the incentives were poorly thought out (see gwern's comments). I will be posting a new better structured contest in the near future (now posted). If you feel this is unfair or otherwise feel slighted, please contact me at my username at gmail.com.
I'm interested in making projects happen on Less Wrong. In order to find out what works and to inspire others to try things too, I'm sponsoring the following small project:
I hereby offer a prize to the first person to submit a good summary of the evidence on Spaced Repetition to the main page. The winner will get the prize, currently: $265 + 40 to charity (see comments)
The summary should address at least the following questions: