I am very concerned about the amount of buyers that I speak with that are unaware of how our local property taxes are calculated.
First and foremost the current homeowners property taxes (the number you see on the MLS printout) is NOT what you will be paying. That amount is what the current seller is paying and is based on the price they purchased the home for (whether that was 2 years ago or 10 years ago). I personally feel that it should not be included on the printouts because it can lead to confusion, in reality it means nothing to you as a buyer.
When a home is sold,the home is reassessed by the property appraiser which usually leads to higher property taxes (homes tend to appreciate in value).
Below are links to a few local property tax estimator websites. To find what your estimated taxes will be you will need to type in the anticipated purchase price. The program will calculate the taxes based on that solely-the street address does not matter and has no bearing on what your estimated taxes will be (city may be required).
Orange County FL http://www.ocpafl.org/pls/webappI/tax_estimator
Seminole County FL http://www.seminoletax.org/Sctaxest.htm
Volusia County http://webserver.vcgov.org/tax_estimator.html
If you base your decision to buy a home on the current seller's property taxes, be prepared for a rude awakening!
Addition: I found more information about local property tax information on the Orlando Sentinel