Index: wp-includes/css/editor.css
===================================================================
--- wp-includes/css/editor.css	(revision 22289)
+++ wp-includes/css/editor.css	(working copy)
@@ -1043,11 +1043,12 @@
 }
 
 .wp-media-buttons .button {
-	margin-right: 5px;
+	line-height: 17px;
+	margin: 0 5px 0 0;
 }
 
 .wp-media-buttons .insert-media {
-	padding-left: 0.4em;
+	padding: 4px 9px 2px 5px;
 }
 
 .wp-media-buttons a {
@@ -1069,6 +1070,11 @@
 	margin: 0 2px;
 }
 
+.wp-media-buttons .button span.wp-media-buttons-icon {
+	float: left;
+	margin: 1px 6px 1px 5px;
+}
+
 .wp-media-buttons .add_media span.wp-media-buttons-icon {
 	background: url('../../wp-admin/images/media-button.png') no-repeat top left;
 }