We have free bumperstickers saying "Break the Cycle of Violence/Don't hit your kids." If you want one, just send us an SASE (Quarry Hill, Rochester, VT 05767).
But look into NOSPANK. They have a lot of very helpful and useful info, and really know whence the battle against hitting kids is joined.
"Hitting a child is worse than MURDER!"
-- Irving Fiske