I went into this trying to solve my own problem of being able to take better notes from the content I watch/listen to. Having talked with a few people about the idea I figured this could actually be build into something.
The Problem:
I'm always watching (mostly listening) to Youtube videos/podcasts - while I run on the treadmill, bike, drive etc. But when I hear a comment I want to remember for later there is no great way to take note of that. I also can't go back and search very effectively as most podcasts don't have transcripts - just timestamps.
The solution:
An interface where you can add your Youtube video and add bookmarks with just a tap of a button. Optionally add tags or your notes on why you saved that part and get the transcript for just that section.
So far, that is all I have but I have future plans for better tagging, playlists, learning communities, adding in your own notes and content generation.