I think it would be helpful to split out the Panhandle from the existing North Florida board. As defined on this board North Florida is a huge area, stretching ~400 miles east to west. As far as terminology, I'd also think that anyone that lives in the Panhandle would say that they live in the Panhandle, not North Florida (
Wikitravel seems to agree about the terminology). Jacksonville alone could support a forum community: it's the 40th-largest metropolitan statistical area in the country and it alone gets enough posting to create a useful forum on another board (Eccie seems to be a much better board technically/for usability, though, so I'd like to see it do well). Jacksonville is the core of the First Coast, but I could see a useful geographic grouping for a forum stretching out to about Gainesville. If the board were more targeted than it is now I also think it would become more useful to members and thereby generate more traffic (a network effect).