[Yurij]

I was not much wrong, the task easier, here is a solution to your problem.

1. Create "Extra fileds" for the author, called "author" (name of the field should not be changed, Default value - Empty).

2. Create a new file "skin1/modules/Extra_Fields/product2.tpl" with the following content:

PHP Code:

{section name=field loop=$products[product].extra_fields}
{if $products[product].extra_fields[field].active eq "Y" && $products[product].extra_fields[field].value && $products[product].extra_fields[field].field eq "author"}
<b>{$products[product].extra_fields[field].field}</b> - 
{$products[product].extra_fields[field].value}
<br>
{/if}
{/section} 


3.Edit the file "skin1/customer/main/products.tpl"
after lines (for xcart 4.1.9 gold):

PHP Code:

<a href="product.php?productid={$products[product].productid}&amp;cat={$cat}&amp;page={$navigation_page}{if $featured eq 'Y'}&amp;featured{/if}"><font class="ProductTitle">{$products[product].product}</font></a>
{if $config.Appearance.display_productcode_in_list eq "Y" and $products[product].productcode ne ""}
<br />
{$lng.lbl_sku}: {$products[product].productcode}
{/if} 


insert next lines:

PHP Code:

<br>
{if $active_modules.Extra_Fields ne ""}
{include file="modules/Extra_Fields/product2.tpl"}
{/if} 


4. Happy end

When the module is active "extra fileds, and the product in the" featured product", and for "extra fileds" defined value "author " - will be displayed.

It also displays the value of field "author" when viewing content category.
If the feature is not required, need to make some changes.