Charging for Library Services?

The Library Garden blog recently had a post about charging for some premium library services, such as books by mail or a rental collection for popular items. Check out the post here (http://librarygarden.blogspot.com/2009/06/freemium-or-should-libraries-charge-for.html). What do you think of that idea? Should libraries consider offering some of their premium services for a fee? Share your thoughts in the comments section!