Venice, Italy, installs Wi-Fi free for those who live and work there, and for-fee for visitors: The city of canals has launched one of the largest outdoor Wi-Fi networks in continental Europe. (The UK has a number of outdoor networks that may be as large.) The network is free for residents, and in September will be opened at no cost to people who work or study in the city. Also in September, visitors can pay €5 per day for access, although advance-purchase discounted passes are also available as part of a visitors' program.
Fabio Zambelli has an extensive photo gallery (and coverage in Italian) at setteB.it.
Service initially covers downtown, the Lido, and public parks in Mestre. Additional islands and parks will be added by the fall.