Index: modules/profile.module
===================================================================
--- modules/profile.module	(revision 6606)
+++ modules/profile.module	(working copy)
@@ -537,7 +537,7 @@
       case 'checkbox':
         return $browse ? l($field->title, 'profile/'. $field->name) : check_plain($field->title);
       case 'url':
-        return '<a href="'. check_url($value) .'">'. check_plain($value) .'</a>';
+        return '<a rel="nofollow" href="'. check_url($value) .'">'. check_plain($value) .'</a>';
       case 'date':
         $format = substr(variable_get('date_format_short', 'm/d/Y - H:i'), 0, 5);
         // Note: Avoid PHP's date() because it does not handle dates before