Splatfrog is a website with hours of lecture/demo videos by veteran animator, Ken Fountain. It has both free and paid videos.
Splatfrog
Kenny Roy
Kenny Roy is a 16 year veteran of the animation industry, and 7 year Mentor from Animation Mentor. Sign up to his members section for Monthly Videos, In-Depth Articles and more!
Animators Resource
Animators Resource is a similar website to this one but focuses more on specific posts and videos rather than linking to other websites.
Kristjan Zadziuk – Youtube
Kristjan Zadziuk is an animation director at Ubisoft and has a bunch of great youtube videos that include game animation, motion matching, showreel reviews and more!
Animator's Resource Kit 