Here's a behind the scenes peek at a recent shoot if anyone is interested. Lighting set-up was fairly simple and is explained below. Note: The toast was shot separately and was suspended above the toaster and composited in post-production, as was the smoke.

As a composite shot all components were treated separately so I can control every aspect  to look exactly how I want it to look for the final image.

Tracing paper was used to diffuse the light (doubled over to increase diffusion), a mix of bare flash through refelectors (for harder more direct reflections) and honeycomb grids (for softer, more gradiated reflections) shot through diffusers was used to create the effect. It took about 2-3 hours to edit the image in photoshop and about 4 hours to photograph all the components. 

The final edit...