On July 27, WAMU's Kojo Nnamdi show discussed broadband. They read a comment from me noting the successes of two community networks. You can listen to the show online from the above link.
The very best value connection in the country is in Lafayette, Louisiana, with 10Mbps symmetrical (up and down) for under $30 /month.
The fastest citywide connection is in Chattanooga, Tennessee - 150Mbps.
Both are provided by city-owned utilities.