I made a workaround for this issue on my WP 3.0 install:
<?php
$thisuser = wp_get_current_user();
if ( 0 == $thisuser->ID ) { // Not logged in.
} else { // Logged in.
echo '<li><a href="' . get_option('siteurl') . '/wp-admin/profile.php">Logged in as ' . $thisuser->display_name .'</a></li>';
}
?>