Pittsburgh on Monday launched a free, public wireless network in two downtown parks and plans to eventually cover a four-square-mile area of downtown with the network, according to c|net. Once fully implemented, the Pittsburg Public Wireless Internet, as it is called, will charge about US$20 a month for access. Many cities across the U.S. have begun envisioning their own public wireless networks, including Jacksonville, FL, and Ashland, OR.