Tampa has pretty good public transportation when compared to other metro areas of florida.... but lack the quality and frenquency of many northern metro transportation areas.
there are plenty of cabs, the busses run regularly, the trolleys i think run in limited areas of the city(mostly around ybor city i think, and channelside).
Both the trolleys and busses are easily accessable, and the cabs tend to be a little expensive for getting around.
you guys have the right links, they explain the routes, and schedules better than i can.