[leon]

Thats done in /skin1/customer/main/cart_details.tpl. What you have to do is change the assigned value for the output from the database table to another field.

Look for a line like this:

<td>{if $products[prod_num].productcode}{$products[prod_num].productcode}{else}#{$products[prod_num].productid}{/if}</td>

And change to this:

<td>{if $products[prod_num].product}{$products[prod_num].product}{else}#{$products[prod_num].productid}{/if}</td>

The productcode field is used for your SKU and product field is the name of the product.
Good luck, dont forget to backup first.