A little late from Jun 15 (2011!), but this just came to my attention: http://www.tampabay.com/news and there's a useful list of locations:
Charging station locations
County parking garage, 319 N. Pierce St., Tampa (2)
St. Pete Times Forum, 401 Channelside Drive, Tampa (2)
Environmental Protection Commission of Hillsborough County, 3629 Queen Palm Drive, Tampa
Jimmie B. Keel Regional Library, 2902 W. Bearss Ave., Tampa
Jan Platt Regional Library, 3910 S. Manhattan Ave., South Tampa
Brandon Regional Library, 619 Vondenburg Road
Town 'N County Commons, 7606 Paula Drive, Tampa
Hillsborough Community College, 4001 W. Tampa Bay Blvd., Tampa