My metering and shooting selections depend on the ambient light, Bryan... both the level of ambient light, and the consistency between various portions of the venue.
At the ceremony, I'm forced to use the ambient as the main light. If flash is permissable, I'll use it for fill.
For the formals and the reception, I'll use my speedlight as the main, and the ambient for fill. Here's a sample, followed by the shooting data.
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Date/Time 01-Jun-2008 18:11:16
Model NIKON D200
Flash Used Yes (manual mode)
Focal Length 35 mm
Exposure Time 1/60 sec
ISO Equivalent 125
Exposure Bias 0
White Balance AWB
Metering Mode matrix
JPEG Quality fine
Exposure Program aperture priority