Just blogged this, but thought I would share it anyway. Just a little idea, might be interesting:
Here's an idea. Take the main idea of turntable.fm and apply it to a tube.
In case you are unaware, turntable.fm is a community where people can DJ 5 tracks to the other listeners. If people like it, they thumbs up his performance and he earns points.
So, if we have huge communities of people that are uploading porn content, they want others to watch what they think is good. Why not let them 'VJ' their porn to the other users? They will enjoy sharing, people will enjoy having a curated show. Site becomes very sticky.
Simple, eh?