we recently finished a zen-cart site for a fitness equipment company called hudson steel co. http://www.hudsonsteelco.com
they are adding more products shortly. it’s got a simple sophisticated look and feel to it. those zen cart sites are mucho work – lots of modifications have to be done to them to get them to look attractive. On the plus side, as an ecommerce package, zen-cart is very robust, offers a lot of options, add-ons from the open source community and has a great administration panel for adding products, etc.