I've responded to this before, but wi-fi is not good for outdoor and extensive installations. The high-quality, robust equipment required for such an undertaking would run in the millions of dollars. And then there are the security problems....

True happiness is knowing you are a hypocrite. -- Ivor Cutler Stimulating the economy as best we can! Further stimulation with Yoga Wear!

• Anderson, Indiana Anderson WiFi 
• Aparecida, Brazil-Free service 
• Balanga City, Bataan, Philippines - free, limited to downtown and several tourist attractions only
• Binghamton, New York - free service
• Bologna Italy - free, historical city center (phase 1), Acantho
• Boston, Massachusetts & Brookline, Massachusetts - paid, Galaxy Internet Services
• Bristol, UK - free, 3km area around city centre 
• Cambridge, Massachusetts - free (pilot), through the Cambridge Public Internet (CPI) Initiative
• Chandler, Arizona - paid service, Kite Networks
• Clearwater Beach, Florida - free service
• Corpus Christi, Texas - paid service, Earthlink
• Fredericton, Canada - free, Fred-e Zone
• Greater Noida, Noida, India -- Paid, operated by Maksat Technologies (P) Ltd, Local ISP.
• Hollywood, Florida - Johnson Controls, Sling Broadband Wimax deploy municipal Wi-Fi network for wireless automated meter reading (AMR), public safety and free Wi-Fi service for residents. Muni Wireless
• Hong Kong - Most are subscribed, paid services, but free service in selected governmental facilities is also available
• Honolulu, Hawaii - free, Tri-Net Solutions LLC
• Kennesaw, Georgia - free, City of Kennesaw WiFi - available in city parks and other areas
• Kuala Lumpur, Malaysia - free, Wireless@KL - Covering major commercial areas.
• La Plata, Argentina - free, city center only
• Lawrence, Kansas - free, Lawrence Freenet, not-for-profit company that works in conjunction with the City of Lawrence and local internet providers
• Leiden, The Netherlands - free, community project covering city and region Wireless Leiden
• Liverpool, UK - paid service, covering central areas.
• Luxor, Egypt - pilot, paid service - tourist areas, TE Data
• Luxembourg, Luxembourg -- Free, currently covering downtown and Central Station Hotcity
• Madison, Wisconsin - paid, only covers central part of city.
• Minneapolis, Minnesota - paid, USI Wireless
• Mississauga, Ontario - free, Wireless access at Mississauga Libraries, Community Centres and Arenas
• Moncton, New Brunswick - free, Service provided by Red Ball Internet of Moncton. Wireless access available at Arenas and Moncton's Public Library. It was also the first city in Canada to provide wireless internet on its public transortation fleet.
• Montreal, Quebec - free, community supported Ilesansfil
• Moose Jaw, Saskatchewan - free, city center and campus
• Moscow, Russia - paid service, Golden Telecom
• Mountain View, California - free - Google WiFi
• Newcastle, County Down, Northern Ireland, UK
• Norwich, England - free, city center and university, 18-month pilot Openlink (Norwich,UK)
• Oulu, Finland - free - panOULU
• Pacifica, California - paid service, PacificaNet
• Paris, France-free-
• Peachtree City, Georgia - free at two parks and the public library/City Hall plaza 
• Perth, Australia - paid, RoamAD-based metro wide coverage in the CBD by metromesh
• Philadelphia, Pennsylvania - free service, recently transferred from Earthlink to a local company
• Pittsburgh, Pennsylvania - free downtown 2 hours per day
• Plattsmouth, Nebraska - free in all public buildings (Court House, Public Library, City Hall, Community Center) and Main Street
• Portland, Oregon - free, covers much of the city - NOW DEFUNCT
• Powell, Ohio - Free, covers downtown
• Prince Albert, Saskatchewan - free, city center and campus
• Regina, Saskatchewan - free, city center and campus
• Saskatoon, Saskatchewan - free, city center and campus
• Sharm el-Sheikh, Egypt - pilot, paid service, tourist areas, EgyNet
• Sherbrooke, Québec, Canada - free, limited to downtown, provided by ZAP Sherbrooke^[47]
• Singapore, Singapore - free/paid, Wireless@SG
• Skokie, Illinois, - Downtown and park areas
• Spokane, Washington - two free hours/day, paid after.
• Storrs, Connecticut - used for students of The University of Connecticut
• Taipei, Taiwan - paid service 'Wifly' by Q-Ware Communications, Inc.
• Taupo, New Zealand, paid/free large RoamAD-based zone in tourist area by Kordia Metro WiFi
• Toronto, Canada - paid service from Toronto Hydro's One Zone. Free service is provided by Wireless Toronto
• Tempe, Arizona - paid service, Kite Networks DEFUNCT
• Winston-Salem, North Carolina - free, limited to downtown. City-operated: no technical support.
  
• Shawinigan, Quebec - free service, limited to downtown. City-operated.
• Southaven, Mississippi - paid service, city-operated, branded as Magnoliawave
• Sud Mennucci, Brazil -- free, limited to downtown. City-operated.
• Zrenjanin, Serbia - free, city center only