I just went to my account page, and then the address book page in your store and it displays fine for me:
Name
Street Address
City, Postcode
State, Country
This address is used as the pre-selected shipping and billing address for orders placed on this store.
This address is also used as the base for product and service tax calculations.
You can put a break in there to space it a lil more:
templates/template_default/templates/tpl_address_book_default.php
Code:
<h2 id="addressBookDefaultPrimary"><?php echo PRIMARY_ADDRESS_TITLE; ?></h2>
<address class="back"><?php echo zen_address_label($_SESSION['customer_id'], $_SESSION['customer_default_address_id'], true, ' ', '<br />'); ?></address>
<br class="clearBoth" />
<div class="instructions"><?php echo PRIMARY_ADDRESS_DESCRIPTION; ?></div>
<br class="clearBoth" />
...save the modified file to your custom folder :)