ChallengePost showcases tons of awesome hacks from the Hackathons it powers, some of which have great demo videos. The goal of HackerTube is to highlight these.
What I learned
This site was mainly an excuse to use Marionette.js, an excellent Backbone.js library. I really recommend this book for anyone trying to learn it as well, it's amazing: https://leanpub.com/marionette-gentle-introduction.
What's next for HackerTube
I have the basics down, listing project videos, and viewing them, but it needs so much more work to be usable. Maybe I'll give this project another go in the future.