I really like commercial ceiling fans. They look pretty sleek but are not intrusive if similar in colour to the ceiling. I have seen them in many churches.
A good Canadian company is Canarm (
http://www.canarm.com). A good search should find some U.S. sites.
Envirofan may be a good U.S. company.
[This message has been edited by Charles (edited 05-22-2006).]