The state pre-kindergarten program in Florida is generally derided for covering only three hours a day during the school year and not spending enough money to make the program all that effective. But, still, it's something. The Miami Herald reports that even though Broward County officials have placed ads on buses, on the radio, cable television and the newspaper, a lot of parents say they knew nothing about the program. ''It's not surprising, but it's a little disappointing how many people still haven't heard about it,'' said the coalition's executive director, Penny Westberry. Shows that newspapers can play an important role in telling parents about the services that are available and helping them learn how to sign up.