<checkout_cart_index translate="label">
        <reference name="root">
            <action method="setTemplate"><template>page/2columns-right.phtml</template></action>
        </reference>
 </checkout_cart_index>

<checkout_cart_index translate="label">
        <label>Shopping Cart</label>
        <remove name="right"/>
        <remove name="left"/>
        <!-- Mage_Checkout -->
        <reference name="root">
            <action method="setTemplate"><template>page/1column.phtml</template></action>
        </reference>

<checkout_cart_index translate="label">
        <label>Shopping Cart</label>
        <reference name="root">
            <action method="setTemplate"><template>page/2columns-right.phtml</template></action>
        </reference>