Index: wp-admin/js/post.dev.js
===================================================================
--- wp-admin/js/post.dev.js	(Revision 18277)
+++ wp-admin/js/post.dev.js	(Arbeitskopie)
@@ -288,6 +288,18 @@
 		// Ajax Cat
 		$('#new' + taxonomy).one( 'focus', function() { $(this).val( '' ).removeClass( 'form-input-tip' ) } );
 		$('#' + taxonomy + '-add-submit').click( function(){ $('#new' + taxonomy).focus(); });
+		
+		$('#new'+taxonomy+'_parent, #new' + taxonomy ).live( 'keyup', function( e ) {
+			if ( 13 == e.which ) {
+				$( '#' + taxonomy + '-add-submit' ).trigger( 'click' );
+				return false;
+			}
+		}).live( 'keypress', function(e){
+			if ( 13 == e.which ) {
+				e.preventDefault();
+				return false;
+			}
+		});
 
 		syncChecks = function() {
 			if ( noSyncChecks )