Photo by andy_5322 under creative commons
In a store today I saw something that I've seen advertised recently: Dr. Scholl's Footmapper. It purportedly helps one determine which shoe inserts to buy.
I didn't try it, but it did make me think of shoe store gizmos from before my time that I'd heard of. Fortunately, these quaint foot-cancer-inducing machines are documented on the web.