I love the shop, Mike :) I think the design looks fantastic and it works well for your shop, and the photos are really amazing.
I think one little thing that I would change is to take away the image borders when you mouse over the thumbnail images on the product pages, or otherwise make it so that things don’t get so “jiggly” and move around so much when you mouse over them (due to the borders popping in and out).
One way you could keep the mouseover red border and not have any resizing jigglies is to give the thumbnails a border the rest of the time that’s also 3px and the colour of the background. This works great in firefox but I’m not sure about other browsers.
Thats great, love it!