this patch fixes problem that /user/password generates 404 not found page
http://drupal.org/node/23350

--- ./mass_url.module	2004-11-24 17:00:33.000000000 +0200
+++ /tmp/mass_url.module	2005-12-06 17:30:16.000000000 +0200
@@ -59,7 +61,7 @@
     return;
   }
   else if ($url_username == ('password')) {
-    user_page();
+    user_pass();
     return;
   }
   else if ($url_username == ('help')) {

similiar problem and a fix
http://drupal.org/node/18933
--- ./mass_url.module	2005-12-06 17:32:15.000000000 +0200
+++ /tmp/mass_url.module	2005-12-06 18:00:44.000000000 +0200
@@ -49,6 +49,11 @@
 
   $page_type = urldecode(arg(0));
   $url_username = urldecode(arg(1));
+
+  if (($page_type == 'blog') && ($url_username == 'feed')) {
+    blog_feed_last();
+    return;
+  }
    
   if ($url_username == ('login')) {
     user_page();