There's a book out called
Official Kubaton Techniques, co-written by Tak Kubota. You should be able to order it here:
http://www.spyhq.com/personal/keychain.htm
Tak Kubota also wrote a book called
Action Kubaton, but I've never been able to find it.
Kubaton techniques can translate pretty well for use with a flashlight, especially if you have one of the 'C' cell lights.
LawDog