Your training manual is a great place to come up with ideas for staff meetings. At every staff meeting, you should include a segment for "on-going training and review". Choose something your staff was supposed to have learned in training and review it. Also, this is a great opportunity to share changes in any laws that affect the employee, like the upcoming healthcare law, health codes, labor laws, etc.
There are also things that likely don't make it into your original training that can be tackled in a segment in monthly meetings, like your disaster plan, first aid and CPR, food safety, HAZMAT manual review, etc.