Index: wp-settings.php
===================================================================
--- wp-settings.php	(revision 6149)
+++ wp-settings.php	(working copy)
@@ -95,8 +95,12 @@
 }
 timer_start();
 
-// Change to E_ALL for development/debugging
-error_reporting(E_ALL ^ E_NOTICE);
+// define('WPDEBUG',true); in wp-config.php for development notices
+if (defined('WPDEBUG') and WPDEBUG == true) {
+   error_reporting(E_ALL);
+} else {
+   error_reporting(E_ALL ^ E_NOTICE);
+}
 
 // For an advanced caching plugin to use, static because you would only want one
 if ( defined('WP_CACHE') )