Start with this mod:

http://www.zen-cart.com/index.php?ma...products_id=77


You can separate the product listings by adding some padding to:

.productListing-data {
padding-bottom:2em;
}


after you break the .productListing-data out from the big pile of stuff that starts with .centeredContent in your stylesheet.

If you don't have the Firefox browser and the Web Developers plugin, you should. Makes finding stuff like this easy.