Very simple so far. Uses http://www.awkwardgroup.com/sandbox/awkward-showcase-a-jquery-plugin/ which is yet another jquery slideshow plugin.
Keep doing slideshows in Spree apps that link to products so that's what this does. Will become more evolved later as I need this quite often.
Copyright (c) 2011 Dom Stockdale, released under the New BSD License or whatever license permits you to do whatever you like.