Today is the last day to register to vote in the statewide August primary. There's umpteen different primary races this year state house, school board, county commission and you want to have a say (Keep your eye out for future CL election coverage closer to the primary).
If you think you are registered, but not sure, call your county's election office to check (Pinellas County residents can check online here). If you just moved within your county, you can call and change your address. Otherwise, go online or head to the library to fill out a new application.
Here's the links to the election offices: