Honest, I thought of this before the podcast thread came up. YouTube can be a cesspool, but it can also be a great place to learn and be entertained. Who do you like to watch?
Here are mine:
Path Less Pedaled They're all about the supple life; right now Russ and (sometimes) Laura ride gravel, and Russ reviews bikes; he also invented the Bicycle Flavor Wheel to help explain geometry.
Henrywildeberry He and Ms. Cools take long rando rides around northern California, and he discusses bikes.
Seth's Bike Hacks Not that I'm a mt biker, but I've learnt a lot about off-road riding from him. Also, he's fun.
Iohan Gueorguiev He started at the Arctic Ocean, and five years later he's getting close to Argentina. He's a madman on an awesome adventure.
rad bike adventure Two women touring; just discovered them, and they seem pretty cool.