As the website mentions, they’re a little software-specific, but you never know what sort of stuff you might draw from them regardless. I hand-letter and still consider this sort of stuff to be good to watch and try and understand, I feel like it really does help my own craft.
Also, a more traditional inking (with brushes on paper) tutorial has been floating around from cartoonist Anton Emdin, and it’s also really good as a resource and learning thing. You should check it out as well as other inking tutorials he has at his site as well.
Hope you enjoy ’em and learn something from them, I sort of feel that I did.