No, Florida doesn't do anything special to encourage hybrid buying.
I don't really count the $5 HOV sticker as much of an incentive since I don't live in downtown Miami or Ft. Lauderdale.
They have had some sales tax exemption bills die in committee, but you can write off your sales tax from your federal return anyway.
Make sure you check on the Federal Hybrid Tax Credit (they have a schedule for all hybrid vehicles sold in the US).
Here's a link with the amounts:
http://www.fueleconomy.gov/feg/tax_hybrid.shtml