This tool gives you free access to CS50 supplementary resources, structured in a way that they won't consume more than 10 minutes of your time at a stretch. The resources, crafted by ex-CS50 students, give a better understanding of the concepts and the problems faced in psets.
It would be really amazing to have people here as early users, please do sign up. Thanks.
Screenshots here: http://imgur.com/a/0LrgX