--- a/jquery-nightly.js	2009-08-15 13:13:01.000000000 -0700
+++ b/jquery-nightly.js	2009-08-15 13:12:27.000000000 -0700
@@ -2358,8 +2358,8 @@
 	insertAfter: "after",
 	replaceAll: "replaceWith"
 }, function(name, original){
-	jQuery.fn[ name ] = function( selector ) {
-		var ret = [], insert = jQuery( selector );
+	jQuery.fn[ name ] = function( selector, context ) {
+		var ret = [], insert = jQuery( selector, context );
 
 		for ( var i = 0, l = insert.length; i < l; i++ ) {
 			var elems = (i > 0 ? this.clone(true) : this).get();

So far I've wished for this on two occasions,

• when I wanted to append to elements in another window,

...appendTo('body', selenium.browserbot.getCurrentWindow().document);

• and when I wanted to append to elements with a selector, but only under this DOM element,

...appendTo('ul', this);