5-S is part of the Japanese TQM movement, a tool mixed into the philoshopy (Hoshin) just like Kaizen. As far as how this mixes into QS9000, well, I would say that it is organizational culture that blends the two, provided that senior management shares in the philosophy of TQM. In my opinion, most organizations that go down the road of QS9000 are not interested in TQM. They are interested in doing business with the Big 3, who make QS9000 a requirement.
Regards,
Kevin