http://csunplugged.org. (2005 version). See also http://www.youtube.com/watch?v=Pz7dLWvi2w0 for binary counting explained in the CSUnplugged Show.
English Computer Science Unplugged Part 1 Binary 2005
English Computer Science Unplugged Part 1 Binary 2005
Cs Unplugged Binary Digits sample Classroom Lesson
Computer Science Unplugged The Show Part 1 Introduction
English Computer Science Unplugged Part 3 Parity 2005
Unplugged The Show Part 3 Binary Numbers Email