This is pretty straightforward to do, and is described in other threads.
Edit /includes/modules/your_template/product_listing.php and comment out zen_clean_html in two places as shown here:
PHP Code:
case 'PRODUCT_LIST_NAME':
$lc_class = 'pLName';
$lc_align = '';
if (isset($_GET['manufacturers_id'])) {
$lc_text = '<h3 class="itemTitle"><a href="' . zen_href_link(zen_get_info_page($listing->fields['products_id']), 'products_id=' . $listing->fields['products_id']) . '">' . $listing->fields['products_name'] . '</a></h3><div class="listingDescription">' . zen_trunc_string(/*zen_clean_html gjh42 4/29/06*/(stripslashes(zen_get_products_description($listing->fields['products_id'], $_SESSION['languages_id']))), PRODUCT_LIST_DESCRIPTION) . '</div>' ;
} else {
$lc_text = '<h3 class="itemTitle"><a href="' . zen_href_link(zen_get_info_page($listing->fields['products_id']), ($_GET['cPath'] > 0 ? 'cPath=' . $_GET['cPath'] . '&' : '') . 'products_id=' . $listing->fields['products_id']) . '">' . $listing->fields['products_name'] . '</a></h3><div class="listingDescription">' . zen_trunc_string(/*zen_clean_html gjh42 4/29/06*/(stripslashes(zen_get_products_description($listing->fields['products_id'], $_SESSION['languages_id']))), PRODUCT_LIST_DESCRIPTION) . '</div>';
}
break;
In admin > Configuration > Product Listing, set
Display Product Description
to a larger number than you are ever likely to use, like 2000
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