www.mobilitywod.com - Doctor of Physical Therapy, Kelly Starrett, brings you mobility videos galore. Some require a subscription to view.
www.gymnasticswod.com - Gymnastics guru, Carl Paoli, brings you tons and tons of videos for all your gymnastics needs. Excellent site for learning how to do things you can't, perfect things you can, and discover movements you didn't even know existed.
FuBarbell - Website of the ever-awesome Diane Fu