One way to improve the utility of this site would be to allow users to view ANY rating for ANY last, regardless of the size. In particular, it would be very useful to see the relative comparisons from people who have rated more than one last regardless of whether they have a similar foot size to you.
For example, say my ideal size is a 9D in a particular Alden last and I'm thinking about purchasing shoes in a UK size. If there was another user who is, say, a size 11D in that same Alden last, says it fits perfectly, and has also reported that a UK 10.5 for a particular last is a tad too roomy but that a UK 10 fits perfectly, this is information that can be very valuable.
I might be missing something on this site, but it appears that I am only able to see ratings/information on shoes that are very similar to my own size. The vast majority of information contained on the site is hidden from me. Even though such info doesn't pertain directly to my size, I would still like to see it.
The best format would be to allow users to see other "user profiles" that show every shoe/last that user has rated. An expanded comments section under each rating would also help tremendously. A great way to increase user participation would be to allow other users to post question/comments on "user profiles", and perhaps additionally start a "forum" section that allows more direct inter-communication from users.
This site is a great idea, but I think you could do a lot more to make it more user friendly and more useful as a whole.
Good luck with it!