http://www.1000ventures.com/business_guide/lean_production_main.html
youtube video on lean production:
http://www.youtube.com/watch?v=4GcJBgQ71TM&feature=related
youtube video on Kaizen:
http://www.youtube.com/watch?v=Q89qAbAAR3Q&feature=related
Another useful site which looks at the history of lean production:
http://www.strategosinc.com/just_in_time.htm
Kanban:
http://www.thetimes100.co.uk/theory/theory--lean-production--252.php