Well, the new house I'm moving in to has three prong outlets, but in the course of construction I discovered that they don't bring the grounding wire back to the breaker box, nor do the houses have a grounding rod with a connection to the breaker box. I had them install a grounding rod and run the ground for every circuit back to the box. I will definitely ground the fridge...

None of our appliances came with a ground pin. That's toaster, blender, microwave, hot water pot and washing machine. I added one to the washer, but not any of the others.