Tampa
For a list of show dates, etc. in the Tampa / Central Florida area check out Cacophony / The Metal Underground: http://www.tampametalradio.com.
Bar / club in Tampa where a lot of Metal concerts take place. Open Monday - Saturday 11.00 am to 03.00 am and Sunday 01.00 pm to 03.00 am.
Small Metal club which has lots of underground bands playing. Check their website for the schedule.
Need a place to go in Ybor? Try Reservoir Bar, the Finest Hole-in-the-Wall in Town! Plays metal, for the most part.
This is not exactly a Metal club, but a lot of them hang out there. They mostly play Gothic and Industrial kind of music. The place has a cool bar downstairs with 80's Euro playing. Check their website for events and a map.
This venue has a variety of shows, but a lot of major Metal shows are taking place here. Besides there's a long list of local bands at this venue - just check their website for upcoming events.