Tom - a nice site - well done! Following on from HandyMac's earlier comment re: image size, I noticed that 2 of the images on your product page are still large (about 150K each). Well worth fixing as you don't want customers waiting for your products to display, of all things.
Another tip (re: picture size) is to use thumbnails (v.small versions of each picture), which when clicked on either display a popup window with a hirez image, or take you to a page with a bigger image & more details.
That way your products get display super quickly. I don't know which web tool you're using (if at all), but many have tools/gizmos that allow you to create thumbnails. Failing that, try searching for some free Javascript to do it on the web - there's bound to be something out there that'll do the trick...
Cheers,
Martin.