I don't do much running and my feet are fine, but I'm finding this all very interesting from an observer standpoint.

ncsrbug, it sounds to me (not knowing much) that podiatrists tend to only look at the feet, while the problem might really be further up. Afterall, the footbone is connected to the anklebone, etc. Maybe you could find a physical therapist or similar professional who looks at the whole package. Again, I don't know much, but it just seems like common sense, particularly given Knott's excellent discourse on the topic.