DON'T tolerate harassment. It only takes one action on the part of someone to destroy everything you've accomplished. She recommends that companies start with coaching and counseling for offenders. Building effective workplace behavior right into an employee incentive program is often effective. DON'T take diversity training lightly.
Diversity has to be part of a strategic process that happens on all levels of the company.
If you're not willing to do that, then don't even bother. Diversity training, at bottom, is plain old-fashioned good business.