I'm glad everyone is using & loving their libraries - I work in my tiny village library, and it is a lot of fun.
Some library offerings that I haven't seen mentioned yet: preschool story hour, summer reading programs, periodicals, community meeting rooms, movie days, local history, local yearbooks, copy/printing/fax services, audiobooks, Freegal (free+legal music downloads), hangout for afterschool, drama clubs, inexpensive book sales (weeding and donations)...