Cameras for Interiors

The question I get asked the most by other Real Estate Agents is what camera to use. My criteria for choosing a camera to shoot interiors is:

1. You must have a wide-angle lens at least 24mm
2. The camera must control an external flash unit

These criteria mean there are very few compact digital cameras that are usable for shooting interiors and even with a Digital SLR camera there are very few configurations that work well. I've been compiling a list of cameras, lenses and external flashes that fit my criteria.