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I've recently been using a setup that seems to work well for the dance floor: 3 strobes off camera, 1 or 2 bare and the other(s) with umbrella or brolly box for fill. By just walking around the floor I can get many different kinds of shots, with rim lights, hard light, soft light, etc. I think that this lighting style gives a more romantic feel to the photos than my earlier work, where I used more plain and simple lighting, and all umbrellas. I'm going to give Bruce Dorn's approaches to off-camera flash a shot in the future and experiment with more systematic placements. There's a lot of freedom to be explored with this equipment.
Cake cutting also works great with off camera flash: I can get consistent, well exposed images of everything important, from the cake to the faces and hands, and the cake being smashed into faces with hands.
Sometimes detail shots are made much more interesting with side or back lighting. Another use for off-camera flash.