I would say one of the most useless mashups I have seen. It is about as exciting as watching paint dry.
real-time view of customer reviews at a couple hundred retailers.
ps: I only waited for few minutes though.
Shoe shopping isn't really "fun", it's a utility exercise. The only reason you can't easily order shoes (or other apparel) online is because of the fit issue. A size X from 3 different manufacturers (or 3 styles from the same manufacturer) could vary enough to affect the fit.
So, I can go to Zappos, throw a few shoes I'm interested in into my cart and they're generally at my house the next day. Try them on, keep the ones I want, box the others up and drop the box off at the UPS store on my way to work.
Far less hassle than going to the mall, with a far wider selection and better prices. Not really sure what the downside is, if any.
So if you did try to trace down that person you would be knocking on a random door asking about a shoe they don't own.