If you want product thumbs in listing:
skin/SEO_listing.tpl
Code:
{* Smarty Template SEO_listing.tpl by Fernando Borcel. MascotasMexico.com 2004/10/31 *}
{foreach from=$products item=v key=k}
{$products[$k].product}
{$products[$k].descr}
[img]{if $full_url}{$http_location}{else}{$xcart_web_dir}{/if}/image.php?productid={$products[$k].productid}[/img]
{/foreach}
Demo:
http://www.7dana.com/shop/all_products.html
Also, make your mycatalog.html(all_products.html) a valid HTML, spiders appreciate this.
http://validator.w3.org/check?uri=http://www.7dana.com/shop/all_products.html