http://demo.swfupload.org
http://www.uploadify.com/demos/
http://malsup.com/jquery/form/
http://valums.com/ajax-upload/
http://www.phpletter.com/Our-Projects/AjaxFileUpload/
http://www.ajaxf1.com/tutorial/ajax-file-upload-tutorial.html
http://www.webtoolkit.info/ajax-file-upload.html

http://www.snilesh.com/resources/jquery/jquery-php-multiple-file-upload/