Using Firebug to edit the css
Your shopping cart div can be moved down by editing
div.checkout-container h1 and you can add
margin-top: margin-top: 99px;
skin/common_files/css/main.css
Code:
div.checkout-container h1 {
font-size: 32px;
margin-top: 99px;
}
Try to crop the logo width - Right now it is
900px