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The title is not shown for node/#/delete, due to the $node variable being populated.
Relevant code in page.tpl.php:
<?php if(!empty($node) && $page == 0) { ?>
<div id="cr8"></div>
<?php } else { ?>
<?php if($title) { ?>
<h1 class="pagetitle"><?php print $title ?></h1>
<?php } ?>
<?php } ?>
This is rather important, as without it there is no obvious indication of what node is being deleted (although it's still in the browser's own title).