I don't know if I shared this video that my prof found on youtube, but we watched it during biochem and I really liked it. There are 2 versions, the pretty musical one and the educational one....
pretty - http://www.youtube.com/watch?v=kxSLw1LMvgk
educational - http://www.youtube.com/watch?v=UB6G9GD2KFk
pretty - http://www.youtube.com/watch?v=kxSLw1LMvgk
educational - http://www.youtube.com/watch?v=UB6G9GD2KFk