STARTUP Ideas to Benefit Stanford Students: Please Vote!!

Hello guys,
I have two ideas aimed at making your Stanford life simpler, more fulfilling and efficient. I just want some feedback so I don't waste effort building something you would not appreciate/use. Kindly reply with couple lines, telling me which of the 2 ideas is best!

1 ) I'm thinking of building a platform for Stanford students to share lecture notes/videos of lectures. These are videos that students can record when they attend lecture using their phones/cameras. If you missed a certain lecture, you can then catch up, or if you have concurrent classes some of them are not taped, you can pay a few bucks to catch up. This acts as an incentive for students to take good notes and quality videos for you. Well, sometimes you just wanna sleep in, so it may be useful.

1. A platform for students to be able to plan their classes, given the constraints, prereqs and other stuff which may be time consuming when you try to do it by hand. It's like a course scheduler, painless and useful to help you focus on changing the world.