Because my logout/login link for Drupal 7 was so popular I've decided to post this piece of code that will include the username of the logged in user
<!-- Again, this php code goes in the page.tpl.php or in a block with php filter -->
<?php //this will display the username if the user is logged in
global $user; if ($user->uid) {
print $user->name; }
?>
<?php //this is the same as the old code, printing a link to login or log out
global $user; if (!$user->uid) {
print "<a href='http://".$base_path."/user' class='logged out'>login</a>";
}
else {
print "<a href='http://".$base_path."/user/logout' class='logged in' >logout</a>";
}
?>
Hope you enjoy!