I forgot about Pointy Hat. I love Pointy Hat but I usually only watch it if it comes up in a search on a specific subject i am looking for.I second William SRD and Pointy Hat. Pointy Hat's main thing is giving a new and interesting twist on old ideas, monsters, and classes. He also gives out rules and art based on his ideas free of charge. I don't play 5th myself, so I can't say how good the rules implementation is, but his ideas are always fun to listen to. Here's one of my favorites of his: