[Inner Eye]

Here's what I did in 4.0.9 (should work in 4.0.17 also, but haven't tried).
This will show only the cart details that you would normally see at the top of "checkout".



in customer/main/cart.tpl replace:

{if $products ne ""}
<FORM action="cart.php" method="post" name="cartform">
<TABLE border="0" width="100%">
{section name=product loop=$products}
{if $products[product].hidden eq ""}
<TR><TD width="90" align="center" valign="top">
{if $active_modules.Special_Offers ne "" and $products[product].have_offers}
{include file="modules/Special_Offers/customer/product_offer_thumb.tpl" product=$products[product]}
{else}
{include file="product_thumbnail.tpl" productid=$products[product].productid image_x=$products[product].image_x image_y=$products[product].image_y product=$products[product].product tmbn_url=$products[product].tmbn_url}
{/if}
</TD>
<TD valign="top">
<FONT class="ProductTitle">{$products[product].product}</FONT>



<TABLE border="0" cellpadding="0" cellspacing="0" width="100%"><TR><TD>
{$products[product].descr}
</TD></TR></TABLE>




{if $products[product].product_options ne ""}
{$lng.lbl_selected_options}:

{include file="modules/Product_Options/display_options.tpl" options=$products[product].product_options}




{/if}
{assign var="price" value=$products[product].display_price}
{if $active_modules.Product_Configurator ne "" and $products[product].product_type eq "C"}
{include file="modules/Product_Configurator/pconf_customer_cart.tpl" main_product=$products[product]}
{assign var="price" value=$products[product].pconf_display_price}



{/if}
<DIV align="left">
{if $active_modules.Subscriptions ne "" and $products[product].catalogprice and $products[product].product_type ne "C"}
{include file="modules/Subscriptions/subscription_priceincart.tpl"}
{else}
{if $active_modules.Special_Offers}
{include file="modules/Special_Offers/customer/cart_price_special.tpl"}
{/if}
<FONT class="ProductPriceConverting">{include file="currency.tpl" value=$price} x {if $active_modules.Egoods and $products[product].distribution}1<INPUT type="hidden"{else}<INPUT type="text" size=3{/if} name="productindexes[{$products[product].cartid}]" value="{$products[product].amount}"> = </FONT><FONT class="ProductPrice">{math equation="price*amount" price=$price amount=$products[product].amount format="%.2f" assign=unformatted}{include file="currency.tpl" value=$unformatted}</FONT><FONT class="MarketPrice"> {include file="customer/main/alter_currency_value.tpl" alter_currency_value=$unformatted}</FONT>
{if $config.Taxes.display_taxed_order_totals eq "Y" and $products[product].taxes}
{include file="customer/main/taxed_price.tpl" taxes=$products[product].taxes}
{/if}
{if $active_modules.Special_Offers}
{include file="modules/Special_Offers/customer/cart_free.tpl"}
{/if}
{/if}




{include file="buttons/delete_item.tpl" href="cart.php?mode=delete&productindex=`$products[product].cartid`"}
{if $products[product].product_options ne ''}
{if $config.UA.platform eq 'MacPPC' && $config.UA.browser eq 'MSIE'}
{include file="buttons/edit_product_options.tpl" href="javascript: window.open('popup_poptions.php?target=cart&id=`$products[product].cartid`','POptions','width=400,height=350,toolbar=no,status=no,scrollbars=yes,resizable=no,menubar=no,location=no,direction=no');" js_to_href="Y"}
{else}
{include file="buttons/edit_product_options.tpl" href="javascript: window.open('popup_poptions.php?target=cart&id=`$products[product].cartid`','POptions','width=400,height=350,toolbar=no,status=no,scrollbars=yes,resizable=no,menubar=no,location=no,direction=no');"}
{/if}
{/if}
</DIV>
</TD></TR>
<TR><TD colspan="2"><HR size="1" noshade></TD></TR>
{/if}
{/section}
</TABLE>
{if $active_modules.Gift_Certificates ne ""}
{include file="modules/Gift_Certificates/gc_cart.tpl" giftcerts_data=$cart.giftcerts}
{/if}
{include file="customer/main/cart_totals.tpl"}

with:

{if $products ne ""}
<FORM action="cart.php" method="POST" name="cartform">
{if $config.Appearance.show_cart_details eq "Y" or ($config.Appearance.show_cart_details eq "L" and $smarty.get.paymentid ne "" and $smarty.get.mode eq "checkout")}
{include file="customer/main/cart_details.tpl"}
{else}

{include file="buttons/update.tpl" href="javascript: document.cartform.submit()" js_to_href="Y"}
{include file="customer/main/cart_contents.tpl"}
{/if}

<HR noshade size="1">

{include file="customer/main/cart_totals.tpl"}

{if $active_modules.Gift_Certificates ne ""}
{include file="modules/Gift_Certificates/gc_cart.tpl" giftcerts_data=$cart.giftcerts}
{/if}