Muscles http://www.brookscole.com/chemistry_d/templates/student_resources/shared_resources/animations/muscles/muscles.html
Cross Bridge Animations http://www.sci.sdsu.edu/movies/actin_myosin.html
A complete and well illustrated look at muscles http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Muscles.html#CardiacMuscle
Muscle Groups and Names http://www.gwc.maricopa.edu/class/bio201/muscle/mustut.htm
Muscle Tutorials and Quizzes http://www.getbodysmart.com/ap/muscletissue/structures/menu/animation.html
Fantastic Muscle Interaction http://www.bbc.co.uk/science/humanbody/body/interactives/3djigsaw_02/index.shtml?muscles
How muscles really work at the subcellular level http://health.howstuffworks.com/muscle2.htm