Index: wp-includes/css/admin-bar.dev.css
===================================================================
--- wp-includes/css/admin-bar.dev.css	(revision 18298)
+++ wp-includes/css/admin-bar.dev.css	(working copy)
@@ -138,6 +138,10 @@
 	display: block;
 }
 
+#wpadminbar .quicklinks li:hover ul ul {
+  left: auto;
+}
+
 #wpadminbar .quicklinks .menupop li:hover > ul,
 #wpadminbar .quicklinks .menupop li.hover > ul {
 	margin-left: 100%;