Took me ages to find this, using Ubercart 3.x, you want to remove the image from the cart display. Put this in your template.php

remove image from cart

function example_form_alter(&$form, &$form_state, $form_id) {
  // Alters the cart view form at /cart.
  if ($form_id == 'uc_cart_view_form') {
    // Hides the image column since courses don't have product images.
    $form['items']['#columns']['image']['access'] = FALSE;

    // Adds the label to the product description column from the image column.
    $form['items']['#columns']['desc']['cell'] = t('Products');
  }
}

Thanks! This gave me just what I needed.