On August 6, 1996, about 0921 central daylight time, a Beech 58, N4478W, registered to Maddox Enterprises, Inc., was landed gear-up at the Panama City-Bay County International Airport, Panama City, Florida. Visual meteorological conditions prevailed at the time and an IFR flight plan was filed for the 14 CFR Part 91 personal flight. The airplane was substantially damaged and the private-rated pilot, the sole occupant, was not injured. The flight originated about 0800 from the Walker County-Bevill Field Airport, Jasper, Alabama. The pilot stated that the flight was cleared to land runway 14, hold short of runway 5. He further stated that he became pre-occupied by the hold short instructions and traffic advisories, and landed gear-up. He further stated that he did not hear the landing gear warning horn when he reduced the power to land. No determination was made as to whether the gear warning was operational.