It's not perfect, but I moved it over by modifying two files:
content.tpl{if ($main neq 'cart' or $cart_empty) and $main neq 'checkout'}
<div id="left-bar">
{include file="customer/left_bar.tpl"}
</div>
css/altskin.css
#left-bar {
width: 210px;
margin-left: 0;
}
#center-main {
margin: 0 0 0 250px;
padding-bottom: 0;
}