Have you seen?

Page on:
  Using Stepper motors from recycled drives:
        http://www.doc.ic.ac.uk/~ih/doc/stepper/

  Sub-page of the above; Connections for recycled steppers:
        http://www.doc.ic.ac.uk/~ih/doc/stepper/control2/connect.html

  Jones on Stepping Motors:
        http://www.cs.uiowa.edu/~jones/step/index.html

  Cheers,
        Paul B.