FreedomPop
Freedom Pop - Free Internet service for homes. Service is metered and free up to 500 Megabytes per month. The cost is two cents per megabyte over the free 500.
This service requires making a refundable deposit for the connecting device. The deposit is $50 for a thumb drive USB device for one computer at a time, or $100 for a wi-fi device that allows up to 8 connections in the home.