Cap'n Eddie Castelin tends to produce long, chatty, videos with a strong emphasis on teaching. Cap passes along a lifetime of tips, tricks, money saving ideas, tool how-to, skill building, finishing lessons and much more. He also runs a web store with sharpening aids, tool kits, carbide cutters, plans, all at very reasonable prices. Makin' Shavin's is his monthly newsletter.
Brenden Stemp is a highly skilled turner whose videos cover a range of subjects from wood selection, tool reviews, quick video tips and projects.
Mike Waldt shows turning tips, projects, and has a beginner series.
Robo Hippy covers many subjects you won't see anywhere else.
Channels with more emphasis on projects:
Carl Jacobson has 2 channels, one focused on answering questions while the other showcases projects.
Robbie the Woodturner demonstrates unique projects with many tips and tricks along the way.
Alan Stratton spins many unique and interesting turnings.
If you speak Spanish (I don't but still enjoy the videos), Miguel Sanchez has a good channel. I skip the chatty intros since I'm English bound and just watch the turning. Update: Miguel has started doing videos in English!